jQuery JavaScript Library v1.9.1

http://jquery.com/

Includes Sizzle.js

http://sizzlejs.com/

Copyright 2005, 2012 jQuery Foundation, Inc. and other contributors

Released under the MIT license

http://jquery.org/license

Date: 2013-2-4

(function( window, undefined ) {

Can't do this because several apps including ASP.NET trace the stack via arguments.caller.callee and Firefox dies if you try to trace through "use strict" call chains. (#13335) Support: Firefox 18+ "use strict";

var

The deferred used on DOM ready

  readyList,

A central reference to the root jQuery(document)

  rootjQuery,

Support: IE<9 For typeof node.method instead of node.method !== undefined

  core_strundefined = typeof undefined,

Use the correct document accordingly with window argument (sandbox)

  document = window.document,
  location = window.location,

Map over jQuery in case of overwrite

  _jQuery = window.jQuery,

Map over the $ in case of overwrite

  _$ = window.$,

[[Class]] -> type pairs

  class2type = {},

List of deleted data cache ids, so we can reuse them

  core_deletedIds = [],

  core_version = "1.9.1",

Save a reference to some core methods

  core_concat = core_deletedIds.concat,
  core_push = core_deletedIds.push,
  core_slice = core_deletedIds.slice,
  core_indexOf = core_deletedIds.indexOf,
  core_toString = class2type.toString,
  core_hasOwn = class2type.hasOwnProperty,
  core_trim = core_version.trim,

Define a local copy of jQuery

  jQuery = function( selector, context ) {

The jQuery object is actually just the init constructor 'enhanced'

    return new jQuery.fn.init( selector, context, rootjQuery );
  },

Used for matching numbers

  core_pnum = /[+-]?(?:\d*\.|)\d+(?:[eE][+-]?\d+|)/.source,

Used for splitting on whitespace

  core_rnotwhite = /\S+/g,

Make sure we trim BOM and NBSP (here's looking at you, Safari 5.0 and IE)

  rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g,

A simple way to check for HTML strings Prioritize #id over <tag> to avoid XSS via location.hash (#9521) Strict HTML recognition (#11290: must start with <)

  rquickExpr = /^(?:(<[\w\W]+>)[^>]*|#([\w-]*))$/,

Match a standalone tag

  rsingleTag = /^<(\w+)\s*\/?>(?:<\/\1>|)$/,

JSON RegExp

  rvalidchars = /^[\],:{}\s]*$/,
  rvalidbraces = /(?:^|:|,)(?:\s*\[)+/g,
  rvalidescape = /\\(?:["\\\/bfnrt]|u[\da-fA-F]{4})/g,
  rvalidtokens = /"[^"\\\r\n]*"|true|false|null|-?(?:\d+\.|)\d+(?:[eE][+-]?\d+|)/g,

Matches dashed string for camelizing

  rmsPrefix = /^-ms-/,
  rdashAlpha = /-([\da-z])/gi,

Used by jQuery.camelCase as callback to replace()

  fcamelCase = function( all, letter ) {
    return letter.toUpperCase();
  },

The ready event handler

  completed = function( event ) {

readyState === "complete" is good enough for us to call the dom ready in oldIE

    if ( document.addEventListener || event.type === "load" || document.readyState === "complete" ) {
      detach();
      jQuery.ready();
    }
  },

Clean-up method for dom ready events

  detach = function() {
    if ( document.addEventListener ) {
      document.removeEventListener( "DOMContentLoaded", completed, false );
      window.removeEventListener( "load", completed, false );

    } else {
      document.detachEvent( "onreadystatechange", completed );
      window.detachEvent( "onload", completed );
    }
  };

jQuery.fn = jQuery.prototype = {

The current version of jQuery being used

  jquery: core_version,

  constructor: jQuery,
  init: function( selector, context, rootjQuery ) {
    var match, elem;

HANDLE: $(""), $(null), $(undefined), $(false)

    if ( !selector ) {
      return this;
    }

Handle HTML strings

    if ( typeof selector === "string" ) {
      if ( selector.charAt(0) === "<" && selector.charAt( selector.length - 1 ) === ">" && selector.length >= 3 ) {

Assume that strings that start and end with <> are HTML and skip the regex check

        match = [ null, selector, null ];

      } else {
        match = rquickExpr.exec( selector );
      }

Match html or make sure no context is specified for #id

      if ( match && (match[1] || !context) ) {

HANDLE: $(html) -> $(array)

        if ( match[1] ) {
          context = context instanceof jQuery ? context[0] : context;

scripts is true for back-compat

          jQuery.merge( this, jQuery.parseHTML(
            match[1],
            context && context.nodeType ? context.ownerDocument || context : document,
            true
          ) );

HANDLE: $(html, props)

          if ( rsingleTag.test( match[1] ) && jQuery.isPlainObject( context ) ) {
            for ( match in context ) {

Properties of context are called as methods if possible

              if ( jQuery.isFunction( this[ match ] ) ) {
                this[ match ]( context[ match ] );

...and otherwise set as attributes

              } else {
                this.attr( match, context[ match ] );
              }
            }
          }

          return this;

HANDLE: $(#id)

        } else {
          elem = document.getElementById( match[2] );

Check parentNode to catch when Blackberry 4.6 returns nodes that are no longer in the document #6963

          if ( elem && elem.parentNode ) {

Handle the case where IE and Opera return items by name instead of ID

            if ( elem.id !== match[2] ) {
              return rootjQuery.find( selector );
            }

Otherwise, we inject the element directly into the jQuery object

            this.length = 1;
            this[0] = elem;
          }

          this.context = document;
          this.selector = selector;
          return this;
        }

HANDLE: $(expr, $(...))

      } else if ( !context || context.jquery ) {
        return ( context || rootjQuery ).find( selector );

HANDLE: $(expr, context) (which is just equivalent to: $(context).find(expr)

      } else {
        return this.constructor( context ).find( selector );
      }

HANDLE: $(DOMElement)

    } else if ( selector.nodeType ) {
      this.context = this[0] = selector;
      this.length = 1;
      return this;

HANDLE: $(function) Shortcut for document ready

    } else if ( jQuery.isFunction( selector ) ) {
      return rootjQuery.ready( selector );
    }

    if ( selector.selector !== undefined ) {
      this.selector = selector.selector;
      this.context = selector.context;
    }

    return jQuery.makeArray( selector, this );
  },

Start with an empty selector

  selector: "",

The default length of a jQuery object is 0

  length: 0,

The number of elements contained in the matched element set

  size: function() {
    return this.length;
  },

  toArray: function() {
    return core_slice.call( this );
  },

Get the Nth element in the matched element set OR Get the whole matched element set as a clean array

  get: function( num ) {
    return num == null ?

Return a 'clean' array

      this.toArray() :

Return just the object

      ( num < 0 ? this[ this.length + num ] : this[ num ] );
  },

Take an array of elements and push it onto the stack (returning the new matched element set)

  pushStack: function( elems ) {

Build a new jQuery matched element set

    var ret = jQuery.merge( this.constructor(), elems );

Add the old object onto the stack (as a reference)

    ret.prevObject = this;
    ret.context = this.context;

Return the newly-formed element set

    return ret;
  },

Execute a callback for every element in the matched set. (You can seed the arguments with an array of args, but this is only used internally.)

  each: function( callback, args ) {
    return jQuery.each( this, callback, args );
  },

  ready: function( fn ) {

Add the callback

    jQuery.ready.promise().done( fn );

    return this;
  },

  slice: function() {
    return this.pushStack( core_slice.apply( this, arguments ) );
  },

  first: function() {
    return this.eq( 0 );
  },

  last: function() {
    return this.eq( -1 );
  },

  eq: function( i ) {
    var len = this.length,
      j = +i + ( i < 0 ? len : 0 );
    return this.pushStack( j >= 0 && j < len ? [ this[j] ] : [] );
  },

  map: function( callback ) {
    return this.pushStack( jQuery.map(this, function( elem, i ) {
      return callback.call( elem, i, elem );
    }));
  },

  end: function() {
    return this.prevObject || this.constructor(null);
  },

For internal use only. Behaves like an Array's method, not like a jQuery method.

  push: core_push,
  sort: [].sort,
  splice: [].splice
};

Give the init function the jQuery prototype for later instantiation

jQuery.fn.init.prototype = jQuery.fn;

jQuery.extend = jQuery.fn.extend = function() {
  var src, copyIsArray, copy, name, options, clone,
    target = arguments[0] || {},
    i = 1,
    length = arguments.length,
    deep = false;

Handle a deep copy situation

  if ( typeof target === "boolean" ) {
    deep = target;
    target = arguments[1] || {};

skip the boolean and the target

    i = 2;
  }

Handle case when target is a string or something (possible in deep copy)

  if ( typeof target !== "object" && !jQuery.isFunction(target) ) {
    target = {};
  }

extend jQuery itself if only one argument is passed

  if ( length === i ) {
    target = this;
    --i;
  }

  for ( ; i < length; i++ ) {

Only deal with non-null/undefined values

    if ( (options = arguments[ i ]) != null ) {

Extend the base object

      for ( name in options ) {
        src = target[ name ];
        copy = options[ name ];

Prevent never-ending loop

        if ( target === copy ) {
          continue;
        }

Recurse if we're merging plain objects or arrays

        if ( deep && copy && ( jQuery.isPlainObject(copy) || (copyIsArray = jQuery.isArray(copy)) ) ) {
          if ( copyIsArray ) {
            copyIsArray = false;
            clone = src && jQuery.isArray(src) ? src : [];

          } else {
            clone = src && jQuery.isPlainObject(src) ? src : {};
          }

Never move original objects, clone them

          target[ name ] = jQuery.extend( deep, clone, copy );

Don't bring in undefined values

        } else if ( copy !== undefined ) {
          target[ name ] = copy;
        }
      }
    }
  }

Return the modified object

  return target;
};

jQuery.extend({
  noConflict: function( deep ) {
    if ( window.$ === jQuery ) {
      window.$ = _$;
    }

    if ( deep && window.jQuery === jQuery ) {
      window.jQuery = _jQuery;
    }

    return jQuery;
  },

Is the DOM ready to be used? Set to true once it occurs.

  isReady: false,

A counter to track how many items to wait for before the ready event fires. See #6781

  readyWait: 1,

Hold (or release) the ready event

  holdReady: function( hold ) {
    if ( hold ) {
      jQuery.readyWait++;
    } else {
      jQuery.ready( true );
    }
  },

Handle when the DOM is ready

  ready: function( wait ) {

Abort if there are pending holds or we're already ready

    if ( wait === true ? --jQuery.readyWait : jQuery.isReady ) {
      return;
    }

Make sure body exists, at least, in case IE gets a little overzealous (ticket #5443).

    if ( !document.body ) {
      return setTimeout( jQuery.ready );
    }

Remember that the DOM is ready

    jQuery.isReady = true;

If a normal DOM Ready event fired, decrement, and wait if need be

    if ( wait !== true && --jQuery.readyWait > 0 ) {
      return;
    }

If there are functions bound, to execute

    readyList.resolveWith( document, [ jQuery ] );

Trigger any bound ready events

    if ( jQuery.fn.trigger ) {
      jQuery( document ).trigger("ready").off("ready");
    }
  },

See test/unit/core.js for details concerning isFunction. Since version 1.3, DOM methods and functions like alert aren't supported. They return false on IE (#2968).

  isFunction: function( obj ) {
    return jQuery.type(obj) === "function";
  },

  isArray: Array.isArray || function( obj ) {
    return jQuery.type(obj) === "array";
  },

  isWindow: function( obj ) {
    return obj != null && obj == obj.window;
  },

  isNumeric: function( obj ) {
    return !isNaN( parseFloat(obj) ) && isFinite( obj );
  },

  type: function( obj ) {
    if ( obj == null ) {
      return String( obj );
    }
    return typeof obj === "object" || typeof obj === "function" ?
      class2type[ core_toString.call(obj) ] || "object" :
      typeof obj;
  },

  isPlainObject: function( obj ) {

Must be an Object. Because of IE, we also have to check the presence of the constructor property. Make sure that DOM nodes and window objects don't pass through, as well

    if ( !obj || jQuery.type(obj) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) {
      return false;
    }

    try {

Not own constructor property must be Object

      if ( obj.constructor &&
        !core_hasOwn.call(obj, "constructor") &&
        !core_hasOwn.call(obj.constructor.prototype, "isPrototypeOf") ) {
        return false;
      }
    } catch ( e ) {

IE8,9 Will throw exceptions on certain host objects #9897

      return false;
    }

Own properties are enumerated firstly, so to speed up, if last one is own, then all properties are own.

    var key;
    for ( key in obj ) {}

    return key === undefined || core_hasOwn.call( obj, key );
  },

  isEmptyObject: function( obj ) {
    var name;
    for ( name in obj ) {
      return false;
    }
    return true;
  },

  error: function( msg ) {
    throw new Error( msg );
  },

data: string of html context (optional): If specified, the fragment will be created in this context, defaults to document keepScripts (optional): If true, will include scripts passed in the html string

  parseHTML: function( data, context, keepScripts ) {
    if ( !data || typeof data !== "string" ) {
      return null;
    }
    if ( typeof context === "boolean" ) {
      keepScripts = context;
      context = false;
    }
    context = context || document;

    var parsed = rsingleTag.exec( data ),
      scripts = !keepScripts && [];

Single tag

    if ( parsed ) {
      return [ context.createElement( parsed[1] ) ];
    }

    parsed = jQuery.buildFragment( [ data ], context, scripts );
    if ( scripts ) {
      jQuery( scripts ).remove();
    }
    return jQuery.merge( [], parsed.childNodes );
  },

  parseJSON: function( data ) {

Attempt to parse using the native JSON parser first

    if ( window.JSON && window.JSON.parse ) {
      return window.JSON.parse( data );
    }

    if ( data === null ) {
      return data;
    }

    if ( typeof data === "string" ) {

Make sure leading/trailing whitespace is removed (IE can't handle it)

      data = jQuery.trim( data );

      if ( data ) {

Make sure the incoming data is actual JSON Logic borrowed from http://json.org/json2.js

        if ( rvalidchars.test( data.replace( rvalidescape, "@" )
          .replace( rvalidtokens, "]" )
          .replace( rvalidbraces, "")) ) {

          return ( new Function( "return " + data ) )();
        }
      }
    }

    jQuery.error( "Invalid JSON: " + data );
  },

Cross-browser xml parsing

  parseXML: function( data ) {
    var xml, tmp;
    if ( !data || typeof data !== "string" ) {
      return null;
    }
    try {
      if ( window.DOMParser ) { // Standard
        tmp = new DOMParser();
        xml = tmp.parseFromString( data , "text/xml" );
      } else { // IE
        xml = new ActiveXObject( "Microsoft.XMLDOM" );
        xml.async = "false";
        xml.loadXML( data );
      }
    } catch( e ) {
      xml = undefined;
    }
    if ( !xml || !xml.documentElement || xml.getElementsByTagName( "parsererror" ).length ) {
      jQuery.error( "Invalid XML: " + data );
    }
    return xml;
  },

  noop: function() {},

Evaluates a script in a global context Workarounds based on findings by Jim Driscoll http://weblogs.java.net/blog/driscoll/archive/2009/09/08/eval-javascript-global-context

  globalEval: function( data ) {
    if ( data && jQuery.trim( data ) ) {

We use execScript on Internet Explorer We use an anonymous function so that context is window rather than jQuery in Firefox

      ( window.execScript || function( data ) {
        window[ "eval" ].call( window, data );
      } )( data );
    }
  },

Convert dashed to camelCase; used by the css and data modules Microsoft forgot to hump their vendor prefix (#9572)

  camelCase: function( string ) {
    return string.replace( rmsPrefix, "ms-" ).replace( rdashAlpha, fcamelCase );
  },

  nodeName: function( elem, name ) {
    return elem.nodeName && elem.nodeName.toLowerCase() === name.toLowerCase();
  },

args is for internal usage only

  each: function( obj, callback, args ) {
    var value,
      i = 0,
      length = obj.length,
      isArray = isArraylike( obj );

    if ( args ) {
      if ( isArray ) {
        for ( ; i < length; i++ ) {
          value = callback.apply( obj[ i ], args );

          if ( value === false ) {
            break;
          }
        }
      } else {
        for ( i in obj ) {
          value = callback.apply( obj[ i ], args );

          if ( value === false ) {
            break;
          }
        }
      }

A special, fast, case for the most common use of each

    } else {
      if ( isArray ) {
        for ( ; i < length; i++ ) {
          value = callback.call( obj[ i ], i, obj[ i ] );

          if ( value === false ) {
            break;
          }
        }
      } else {
        for ( i in obj ) {
          value = callback.call( obj[ i ], i, obj[ i ] );

          if ( value === false ) {
            break;
          }
        }
      }
    }

    return obj;
  },

Use native String.trim function wherever possible

  trim: core_trim && !core_trim.call("\uFEFF\xA0") ?
    function( text ) {
      return text == null ?
        "" :
        core_trim.call( text );
    } :

Otherwise use our own trimming functionality

    function( text ) {
      return text == null ?
        "" :
        ( text + "" ).replace( rtrim, "" );
    },

results is for internal usage only

  makeArray: function( arr, results ) {
    var ret = results || [];

    if ( arr != null ) {
      if ( isArraylike( Object(arr) ) ) {
        jQuery.merge( ret,
          typeof arr === "string" ?
          [ arr ] : arr
        );
      } else {
        core_push.call( ret, arr );
      }
    }

    return ret;
  },

  inArray: function( elem, arr, i ) {
    var len;

    if ( arr ) {
      if ( core_indexOf ) {
        return core_indexOf.call( arr, elem, i );
      }

      len = arr.length;
      i = i ? i < 0 ? Math.max( 0, len + i ) : i : 0;

      for ( ; i < len; i++ ) {

Skip accessing in sparse arrays

        if ( i in arr && arr[ i ] === elem ) {
          return i;
        }
      }
    }

    return -1;
  },

  merge: function( first, second ) {
    var l = second.length,
      i = first.length,
      j = 0;

    if ( typeof l === "number" ) {
      for ( ; j < l; j++ ) {
        first[ i++ ] = second[ j ];
      }
    } else {
      while ( second[j] !== undefined ) {
        first[ i++ ] = second[ j++ ];
      }
    }

    first.length = i;

    return first;
  },

  grep: function( elems, callback, inv ) {
    var retVal,
      ret = [],
      i = 0,
      length = elems.length;
    inv = !!inv;

Go through the array, only saving the items that pass the validator function

    for ( ; i < length; i++ ) {
      retVal = !!callback( elems[ i ], i );
      if ( inv !== retVal ) {
        ret.push( elems[ i ] );
      }
    }

    return ret;
  },

arg is for internal usage only

  map: function( elems, callback, arg ) {
    var value,
      i = 0,
      length = elems.length,
      isArray = isArraylike( elems ),
      ret = [];

Go through the array, translating each of the items to their

    if ( isArray ) {
      for ( ; i < length; i++ ) {
        value = callback( elems[ i ], i, arg );

        if ( value != null ) {
          ret[ ret.length ] = value;
        }
      }

Go through every key on the object,

    } else {
      for ( i in elems ) {
        value = callback( elems[ i ], i, arg );

        if ( value != null ) {
          ret[ ret.length ] = value;
        }
      }
    }

Flatten any nested arrays

    return core_concat.apply( [], ret );
  },

A global GUID counter for objects

  guid: 1,

Bind a function to a context, optionally partially applying any arguments.

  proxy: function( fn, context ) {
    var args, proxy, tmp;

    if ( typeof context === "string" ) {
      tmp = fn[ context ];
      context = fn;
      fn = tmp;
    }

Quick check to determine if target is callable, in the spec this throws a TypeError, but we will just return undefined.

    if ( !jQuery.isFunction( fn ) ) {
      return undefined;
    }

Simulated bind

    args = core_slice.call( arguments, 2 );
    proxy = function() {
      return fn.apply( context || this, args.concat( core_slice.call( arguments ) ) );
    };

Set the guid of unique handler to the same of original handler, so it can be removed

    proxy.guid = fn.guid = fn.guid || jQuery.guid++;

    return proxy;
  },

Multifunctional method to get and set values of a collection The value/s can optionally be executed if it's a function

  access: function( elems, fn, key, value, chainable, emptyGet, raw ) {
    var i = 0,
      length = elems.length,
      bulk = key == null;

Sets many values

    if ( jQuery.type( key ) === "object" ) {
      chainable = true;
      for ( i in key ) {
        jQuery.access( elems, fn, i, key[i], true, emptyGet, raw );
      }

Sets one value

    } else if ( value !== undefined ) {
      chainable = true;

      if ( !jQuery.isFunction( value ) ) {
        raw = true;
      }

      if ( bulk ) {

Bulk operations run against the entire set

        if ( raw ) {
          fn.call( elems, value );
          fn = null;

...except when executing function values

        } else {
          bulk = fn;
          fn = function( elem, key, value ) {
            return bulk.call( jQuery( elem ), value );
          };
        }
      }

      if ( fn ) {
        for ( ; i < length; i++ ) {
          fn( elems[i], key, raw ? value : value.call( elems[i], i, fn( elems[i], key ) ) );
        }
      }
    }

    return chainable ?
      elems :

Gets

      bulk ?
        fn.call( elems ) :
        length ? fn( elems[0], key ) : emptyGet;
  },

  now: function() {
    return ( new Date() ).getTime();
  }
});

jQuery.ready.promise = function( obj ) {
  if ( !readyList ) {

    readyList = jQuery.Deferred();

Catch cases where $(document).ready() is called after the browser event has already occurred. we once tried to use readyState "interactive" here, but it caused issues like the one discovered by ChrisS here: http://bugs.jquery.com/ticket/12282#comment:15

    if ( document.readyState === "complete" ) {

Handle it asynchronously to allow scripts the opportunity to delay ready

      setTimeout( jQuery.ready );

Standards-based browsers support DOMContentLoaded

    } else if ( document.addEventListener ) {

Use the handy event callback

      document.addEventListener( "DOMContentLoaded", completed, false );

A fallback to window.onload, that will always work

      window.addEventListener( "load", completed, false );

If IE event model is used

    } else {

Ensure firing before onload, maybe late but safe also for iframes

      document.attachEvent( "onreadystatechange", completed );

A fallback to window.onload, that will always work

      window.attachEvent( "onload", completed );

If IE and not a frame continually check to see if the document is ready

      var top = false;

      try {
        top = window.frameElement == null && document.documentElement;
      } catch(e) {}

      if ( top && top.doScroll ) {
        (function doScrollCheck() {
          if ( !jQuery.isReady ) {

            try {

Use the trick by Diego Perini http://javascript.nwbox.com/IEContentLoaded/

              top.doScroll("left");
            } catch(e) {
              return setTimeout( doScrollCheck, 50 );
            }

detach all dom ready events

            detach();

and execute any waiting functions

            jQuery.ready();
          }
        })();
      }
    }
  }
  return readyList.promise( obj );
};

Populate the class2type map

jQuery.each("Boolean Number String Function Array Date RegExp Object Error".split(" "), function(i, name) {
  class2type[ "[object " + name + "]" ] = name.toLowerCase();
});

function isArraylike( obj ) {
  var length = obj.length,
    type = jQuery.type( obj );

  if ( jQuery.isWindow( obj ) ) {
    return false;
  }

  if ( obj.nodeType === 1 && length ) {
    return true;
  }

  return type === "array" || type !== "function" &&
    ( length === 0 ||
    typeof length === "number" && length > 0 && ( length - 1 ) in obj );
}

All jQuery objects should point back to these

rootjQuery = jQuery(document);

String to Object options format cache

var optionsCache = {};

Convert String-formatted options into Object-formatted ones and store in cache

function createOptions( options ) {
  var object = optionsCache[ options ] = {};
  jQuery.each( options.match( core_rnotwhite ) || [], function( _, flag ) {
    object[ flag ] = true;
  });
  return object;
}

Create a callback list using the following parameters:

options: an optional list of space-separated options that will change how the callback list behaves or a more traditional option object

By default a callback list will act like an event callback list and can be "fired" multiple times.

Possible options:

once: will ensure the callback list can only be fired once (like a Deferred)

memory: will keep track of previous values and will call any callback added after the list has been fired right away with the latest "memorized" values (like a Deferred)

unique: will ensure a callback can only be added once (no duplicate in the list)

stopOnFalse: interrupt callings when a callback returns false

jQuery.Callbacks = function( options ) {

Convert options from String-formatted to Object-formatted if needed (we check in cache first)

  options = typeof options === "string" ?
    ( optionsCache[ options ] || createOptions( options ) ) :
    jQuery.extend( {}, options );

  var // Flag to know if list is currently firing
    firing,

Last fire value (for non-forgettable lists)

    memory,

Flag to know if list was already fired

    fired,

End of the loop when firing

    firingLength,

Index of currently firing callback (modified by remove if needed)

    firingIndex,

First callback to fire (used internally by add and fireWith)

    firingStart,

Actual callback list

    list = [],

Stack of fire calls for repeatable lists

    stack = !options.once && [],

Fire callbacks

    fire = function( data ) {
      memory = options.memory && data;
      fired = true;
      firingIndex = firingStart || 0;
      firingStart = 0;
      firingLength = list.length;
      firing = true;
      for ( ; list && firingIndex < firingLength; firingIndex++ ) {
        if ( list[ firingIndex ].apply( data[ 0 ], data[ 1 ] ) === false && options.stopOnFalse ) {
          memory = false; // To prevent further calls using add
          break;
        }
      }
      firing = false;
      if ( list ) {
        if ( stack ) {
          if ( stack.length ) {
            fire( stack.shift() );
          }
        } else if ( memory ) {
          list = [];
        } else {
          self.disable();
        }
      }
    },

Actual Callbacks object

    self = {

Add a callback or a collection of callbacks to the list

      add: function() {
        if ( list ) {

First, we save the current length

          var start = list.length;
          (function add( args ) {
            jQuery.each( args, function( _, arg ) {
              var type = jQuery.type( arg );
              if ( type === "function" ) {
                if ( !options.unique || !self.has( arg ) ) {
                  list.push( arg );
                }
              } else if ( arg && arg.length && type !== "string" ) {

Inspect recursively

                add( arg );
              }
            });
          })( arguments );

Do we need to add the callbacks to the current firing batch?

          if ( firing ) {
            firingLength = list.length;

With memory, if we're not firing then we should call right away

          } else if ( memory ) {
            firingStart = start;
            fire( memory );
          }
        }
        return this;
      },

Remove a callback from the list

      remove: function() {
        if ( list ) {
          jQuery.each( arguments, function( _, arg ) {
            var index;
            while( ( index = jQuery.inArray( arg, list, index ) ) > -1 ) {
              list.splice( index, 1 );

Handle firing indexes

              if ( firing ) {
                if ( index <= firingLength ) {
                  firingLength--;
                }
                if ( index <= firingIndex ) {
                  firingIndex--;
                }
              }
            }
          });
        }
        return this;
      },

Check if a given callback is in the list. If no argument is given, return whether or not list has callbacks attached.

      has: function( fn ) {
        return fn ? jQuery.inArray( fn, list ) > -1 : !!( list && list.length );
      },

Remove all callbacks from the list

      empty: function() {
        list = [];
        return this;
      },

Have the list do nothing anymore

      disable: function() {
        list = stack = memory = undefined;
        return this;
      },

Is it disabled?

      disabled: function() {
        return !list;
      },

Lock the list in its current state

      lock: function() {
        stack = undefined;
        if ( !memory ) {
          self.disable();
        }
        return this;
      },

Is it locked?

      locked: function() {
        return !stack;
      },

Call all callbacks with the given context and arguments

      fireWith: function( context, args ) {
        args = args || [];
        args = [ context, args.slice ? args.slice() : args ];
        if ( list && ( !fired || stack ) ) {
          if ( firing ) {
            stack.push( args );
          } else {
            fire( args );
          }
        }
        return this;
      },

Call all the callbacks with the given arguments

      fire: function() {
        self.fireWith( this, arguments );
        return this;
      },

To know if the callbacks have already been called at least once

      fired: function() {
        return !!fired;
      }
    };

  return self;
};
jQuery.extend({

  Deferred: function( func ) {
    var tuples = [

action, add listener, listener list, final state

        [ "resolve", "done", jQuery.Callbacks("once memory"), "resolved" ],
        [ "reject", "fail", jQuery.Callbacks("once memory"), "rejected" ],
        [ "notify", "progress", jQuery.Callbacks("memory") ]
      ],
      state = "pending",
      promise = {
        state: function() {
          return state;
        },
        always: function() {
          deferred.done( arguments ).fail( arguments );
          return this;
        },
        then: function( // fnDone, fnFail, fnProgress ) {
          var fns = arguments;
          return jQuery.Deferred(function( newDefer ) {
            jQuery.each( tuples, function( i, tuple ) {
              var action = tuple[ 0 ],
                fn = jQuery.isFunction( fns[ i ] ) && fns[ i ];

deferred[ done | fail | progress ] for forwarding actions to newDefer

              deferred[ tuple[1] ](function() {
                var returned = fn && fn.apply( this, arguments );
                if ( returned && jQuery.isFunction( returned.promise ) ) {
                  returned.promise()
                    .done( newDefer.resolve )
                    .fail( newDefer.reject )
                    .progress( newDefer.notify );
                } else {
                  newDefer[ action + "With" ]( this === promise ? newDefer.promise() : this, fn ? [ returned ] : arguments );
                }
              });
            });
            fns = null;
          }).promise();
        },

Get a promise for this deferred If obj is provided, the promise aspect is added to the object

        promise: function( obj ) {
          return obj != null ? jQuery.extend( obj, promise ) : promise;
        }
      },
      deferred = {};

Keep pipe for back-compat

    promise.pipe = promise.then;

Add list-specific methods

    jQuery.each( tuples, function( i, tuple ) {
      var list = tuple[ 2 ],
        stateString = tuple[ 3 ];

promise[ done | fail | progress ] = list.add

      promise[ tuple[1] ] = list.add;

Handle state

      if ( stateString ) {
        list.add(function() {

state = [ resolved | rejected ]

          state = stateString;

[ rejectlist | resolvelist ].disable; progress_list.lock

        }, tuples[ i ^ 1 ][ 2 ].disable, tuples[ 2 ][ 2 ].lock );
      }

deferred[ resolve | reject | notify ]

      deferred[ tuple[0] ] = function() {
        deferred[ tuple[0] + "With" ]( this === deferred ? promise : this, arguments );
        return this;
      };
      deferred[ tuple[0] + "With" ] = list.fireWith;
    });

Make the deferred a promise

    promise.promise( deferred );

Call given func if any

    if ( func ) {
      func.call( deferred, deferred );
    }

All done!

    return deferred;
  },

Deferred helper

  when: function( subordinate // , ..., subordinateN ) {
    var i = 0,
      resolveValues = core_slice.call( arguments ),
      length = resolveValues.length,

the count of uncompleted subordinates

      remaining = length !== 1 || ( subordinate && jQuery.isFunction( subordinate.promise ) ) ? length : 0,

the master Deferred. If resolveValues consist of only a single Deferred, just use that.

      deferred = remaining === 1 ? subordinate : jQuery.Deferred(),

Update function for both resolve and progress values

      updateFunc = function( i, contexts, values ) {
        return function( value ) {
          contexts[ i ] = this;
          values[ i ] = arguments.length > 1 ? core_slice.call( arguments ) : value;
          if( values === progressValues ) {
            deferred.notifyWith( contexts, values );
          } else if ( !( --remaining ) ) {
            deferred.resolveWith( contexts, values );
          }
        };
      },

      progressValues, progressContexts, resolveContexts;

add listeners to Deferred subordinates; treat others as resolved

    if ( length > 1 ) {
      progressValues = new Array( length );
      progressContexts = new Array( length );
      resolveContexts = new Array( length );
      for ( ; i < length; i++ ) {
        if ( resolveValues[ i ] && jQuery.isFunction( resolveValues[ i ].promise ) ) {
          resolveValues[ i ].promise()
            .done( updateFunc( i, resolveContexts, resolveValues ) )
            .fail( deferred.reject )
            .progress( updateFunc( i, progressContexts, progressValues ) );
        } else {
          --remaining;
        }
      }
    }

if we're not waiting on anything, resolve the master

    if ( !remaining ) {
      deferred.resolveWith( resolveContexts, resolveValues );
    }

    return deferred.promise();
  }
});
jQuery.support = (function() {

  var support, all, a,
    input, select, fragment,
    opt, eventName, isSupported, i,
    div = document.createElement("div");

Setup

  div.setAttribute( "className", "t" );
  div.innerHTML = "  <link/><table></table><a href='/a'>a</a><input type='checkbox'/>";

Support tests won't run in some limited or non-browser environments

  all = div.getElementsByTagName("*");
  a = div.getElementsByTagName("a")[ 0 ];
  if ( !all || !a || !all.length ) {
    return {};
  }

First batch of tests

  select = document.createElement("select");
  opt = select.appendChild( document.createElement("option") );
  input = div.getElementsByTagName("input")[ 0 ];

  a.style.cssText = "top:1px;float:left;opacity:.5";
  support = {

Test setAttribute on camelCase class. If it works, we need attrFixes when doing get/setAttribute (ie6/7)

    getSetAttribute: div.className !== "t",

IE strips leading whitespace when .innerHTML is used

    leadingWhitespace: div.firstChild.nodeType === 3,

Make sure that tbody elements aren't automatically inserted IE will insert them into empty tables

    tbody: !div.getElementsByTagName("tbody").length,

Make sure that link elements get serialized correctly by innerHTML This requires a wrapper element in IE

    htmlSerialize: !!div.getElementsByTagName("link").length,

Get the style information from getAttribute (IE uses .cssText instead)

    style: /top/.test( a.getAttribute("style") ),

Make sure that URLs aren't manipulated (IE normalizes it by default)

    hrefNormalized: a.getAttribute("href") === "/a",

Make sure that element opacity exists (IE uses filter instead) Use a regex to work around a WebKit issue. See #5145

    opacity: /^0.5/.test( a.style.opacity ),

Verify style float existence (IE uses styleFloat instead of cssFloat)

    cssFloat: !!a.style.cssFloat,

Check the default checkbox/radio value ("" on WebKit; "on" elsewhere)

    checkOn: !!input.value,

Make sure that a selected-by-default option has a working selected property. (WebKit defaults to false instead of true, IE too, if it's in an optgroup)

    optSelected: opt.selected,

Tests for enctype support on a form (#6743)

    enctype: !!document.createElement("form").enctype,

Makes sure cloning an html5 element does not cause problems Where outerHTML is undefined, this still works

    html5Clone: document.createElement("nav").cloneNode( true ).outerHTML !== "<:nav></:nav>",

jQuery.support.boxModel DEPRECATED in 1.8 since we don't support Quirks Mode

    boxModel: document.compatMode === "CSS1Compat",

Will be defined later

    deleteExpando: true,
    noCloneEvent: true,
    inlineBlockNeedsLayout: false,
    shrinkWrapBlocks: false,
    reliableMarginRight: true,
    boxSizingReliable: true,
    pixelPosition: false
  };

Make sure checked status is properly cloned

  input.checked = true;
  support.noCloneChecked = input.cloneNode( true ).checked;

Make sure that the options inside disabled selects aren't marked as disabled (WebKit marks them as disabled)

  select.disabled = true;
  support.optDisabled = !opt.disabled;

Support: IE<9

  try {
    delete div.test;
  } catch( e ) {
    support.deleteExpando = false;
  }

Check if we can trust getAttribute("value")

  input = document.createElement("input");
  input.setAttribute( "value", "" );
  support.input = input.getAttribute( "value" ) === "";

Check if an input maintains its value after becoming a radio

  input.value = "t";
  input.setAttribute( "type", "radio" );
  support.radioValue = input.value === "t";

#11217 - WebKit loses check when the name is after the checked attribute

  input.setAttribute( "checked", "t" );
  input.setAttribute( "name", "t" );

  fragment = document.createDocumentFragment();
  fragment.appendChild( input );

Check if a disconnected checkbox will retain its checked value of true after appended to the DOM (IE6/7)

  support.appendChecked = input.checked;

WebKit doesn't clone checked state correctly in fragments

  support.checkClone = fragment.cloneNode( true ).cloneNode( true ).lastChild.checked;

Support: IE<9 Opera does not clone events (and typeof div.attachEvent === undefined). IE9-10 clones events bound via attachEvent, but they don't trigger with .click()

  if ( div.attachEvent ) {
    div.attachEvent( "onclick", function() {
      support.noCloneEvent = false;
    });

    div.cloneNode( true ).click();
  }

Support: IE<9 (lack submit/change bubble), Firefox 17+ (lack focusin event) Beware of CSP restrictions (https://developer.mozilla.org/en/Security/CSP), test/csp.php

  for ( i in { submit: true, change: true, focusin: true }) {
    div.setAttribute( eventName = "on" + i, "t" );

    support[ i + "Bubbles" ] = eventName in window || div.attributes[ eventName ].expando === false;
  }

  div.style.backgroundClip = "content-box";
  div.cloneNode( true ).style.backgroundClip = "";
  support.clearCloneStyle = div.style.backgroundClip === "content-box";

Run tests that need a body at doc ready

  jQuery(function() {
    var container, marginDiv, tds,
      divReset = "padding:0;margin:0;border:0;display:block;box-sizing:content-box;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;",
      body = document.getElementsByTagName("body")[0];

    if ( !body ) {

Return for frameset docs that don't have a body

      return;
    }

    container = document.createElement("div");
    container.style.cssText = "border:0;width:0;height:0;position:absolute;top:0;left:-9999px;margin-top:1px";

    body.appendChild( container ).appendChild( div );

Support: IE8 Check if table cells still have offsetWidth/Height when they are set to display:none and there are still other visible table cells in a table row; if so, offsetWidth/Height are not reliable for use when determining if an element has been hidden directly using display:none (it is still safe to use offsets if a parent element is hidden; don safety goggles and see bug #4512 for more information).

    div.innerHTML = "<table><tr><td></td><td>t</td></tr></table>";
    tds = div.getElementsByTagName("td");
    tds[ 0 ].style.cssText = "padding:0;margin:0;border:0;display:none";
    isSupported = ( tds[ 0 ].offsetHeight === 0 );

    tds[ 0 ].style.display = "";
    tds[ 1 ].style.display = "none";

Support: IE8 Check if empty table cells still have offsetWidth/Height

    support.reliableHiddenOffsets = isSupported && ( tds[ 0 ].offsetHeight === 0 );

Check box-sizing and margin behavior

    div.innerHTML = "";
    div.style.cssText = "box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;padding:1px;border:1px;display:block;width:4px;margin-top:1%;position:absolute;top:1%;";
    support.boxSizing = ( div.offsetWidth === 4 );
    support.doesNotIncludeMarginInBodyOffset = ( body.offsetTop !== 1 );

Use window.getComputedStyle because jsdom on node.js will break without it.

    if ( window.getComputedStyle ) {
      support.pixelPosition = ( window.getComputedStyle( div, null ) || {} ).top !== "1%";
      support.boxSizingReliable = ( window.getComputedStyle( div, null ) || { width: "4px" } ).width === "4px";

Check if div with explicit width and no margin-right incorrectly gets computed margin-right based on width of container. (#3333) Fails in WebKit before Feb 2011 nightlies WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right

      marginDiv = div.appendChild( document.createElement("div") );
      marginDiv.style.cssText = div.style.cssText = divReset;
      marginDiv.style.marginRight = marginDiv.style.width = "0";
      div.style.width = "1px";

      support.reliableMarginRight =
        !parseFloat( ( window.getComputedStyle( marginDiv, null ) || {} ).marginRight );
    }

    if ( typeof div.style.zoom !== core_strundefined ) {

Support: IE<8 Check if natively block-level elements act like inline-block elements when setting their display to 'inline' and giving them layout

      div.innerHTML = "";
      div.style.cssText = divReset + "width:1px;padding:1px;display:inline;zoom:1";
      support.inlineBlockNeedsLayout = ( div.offsetWidth === 3 );

Support: IE6 Check if elements with layout shrink-wrap their children

      div.style.display = "block";
      div.innerHTML = "<div></div>";
      div.firstChild.style.width = "5px";
      support.shrinkWrapBlocks = ( div.offsetWidth !== 3 );

      if ( support.inlineBlockNeedsLayout ) {

Prevent IE 6 from affecting layout for positioned elements #11048 Prevent IE from shrinking the body in IE 7 mode #12869 Support: IE<8

        body.style.zoom = 1;
      }
    }

    body.removeChild( container );

Null elements to avoid leaks in IE

    container = div = tds = marginDiv = null;
  });

Null elements to avoid leaks in IE

  all = select = fragment = opt = a = input = null;

  return support;
})();

var rbrace = /(?:\{[\s\S]*\}|\[[\s\S]*\])$/,
  rmultiDash = /([A-Z])/g;

function internalData( elem, name, data, pvt // Internal Use Only ){
  if ( !jQuery.acceptData( elem ) ) {
    return;
  }

  var thisCache, ret,
    internalKey = jQuery.expando,
    getByName = typeof name === "string",

We have to handle DOM nodes and JS objects differently because IE6-7 can't GC object references properly across the DOM-JS boundary

    isNode = elem.nodeType,

Only DOM nodes need the global jQuery cache; JS object data is attached directly to the object so GC can occur automatically

    cache = isNode ? jQuery.cache : elem,

Only defining an ID for JS objects if its cache already exists allows the code to shortcut on the same path as a DOM node with no cache

    id = isNode ? elem[ internalKey ] : elem[ internalKey ] && internalKey;

Avoid doing any more work than we need to when trying to get data on an object that has no data at all

  if ( (!id || !cache[id] || (!pvt && !cache[id].data)) && getByName && data === undefined ) {
    return;
  }

  if ( !id ) {

Only DOM nodes need a new unique ID for each element since their data ends up in the global cache

    if ( isNode ) {
      elem[ internalKey ] = id = core_deletedIds.pop() || jQuery.guid++;
    } else {
      id = internalKey;
    }
  }

  if ( !cache[ id ] ) {
    cache[ id ] = {};

Avoids exposing jQuery metadata on plain JS objects when the object is serialized using JSON.stringify

    if ( !isNode ) {
      cache[ id ].toJSON = jQuery.noop;
    }
  }

An object can be passed to jQuery.data instead of a key/value pair; this gets shallow copied over onto the existing cache

  if ( typeof name === "object" || typeof name === "function" ) {
    if ( pvt ) {
      cache[ id ] = jQuery.extend( cache[ id ], name );
    } else {
      cache[ id ].data = jQuery.extend( cache[ id ].data, name );
    }
  }

  thisCache = cache[ id ];

jQuery data() is stored in a separate object inside the object's internal data cache in order to avoid key collisions between internal data and user-defined data.

  if ( !pvt ) {
    if ( !thisCache.data ) {
      thisCache.data = {};
    }

    thisCache = thisCache.data;
  }

  if ( data !== undefined ) {
    thisCache[ jQuery.camelCase( name ) ] = data;
  }

Check for both converted-to-camel and non-converted data property names If a data property was specified

  if ( getByName ) {

First Try to find as-is property data

    ret = thisCache[ name ];

Test for null|undefined property data

    if ( ret == null ) {

Try to find the camelCased property

      ret = thisCache[ jQuery.camelCase( name ) ];
    }
  } else {
    ret = thisCache;
  }

  return ret;
}

function internalRemoveData( elem, name, pvt ) {
  if ( !jQuery.acceptData( elem ) ) {
    return;
  }

  var i, l, thisCache,
    isNode = elem.nodeType,

See jQuery.data for more information

    cache = isNode ? jQuery.cache : elem,
    id = isNode ? elem[ jQuery.expando ] : jQuery.expando;

If there is already no cache entry for this object, there is no purpose in continuing

  if ( !cache[ id ] ) {
    return;
  }

  if ( name ) {

    thisCache = pvt ? cache[ id ] : cache[ id ].data;

    if ( thisCache ) {

Support array or space separated string names for data keys

      if ( !jQuery.isArray( name ) ) {

try the string as a key before any manipulation

        if ( name in thisCache ) {
          name = [ name ];
        } else {

split the camel cased version by spaces unless a key with the spaces exists

          name = jQuery.camelCase( name );
          if ( name in thisCache ) {
            name = [ name ];
          } else {
            name = name.split(" ");
          }
        }
      } else {

If "name" is an array of keys... When data is initially created, via ("key", "val") signature, keys will be converted to camelCase. Since there is no way to tell how a key was added, remove both plain key and camelCase key. #12786 This will only penalize the array argument path.

        name = name.concat( jQuery.map( name, jQuery.camelCase ) );
      }

      for ( i = 0, l = name.length; i < l; i++ ) {
        delete thisCache[ name[i] ];
      }

If there is no data left in the cache, we want to continue and let the cache object itself get destroyed

      if ( !( pvt ? isEmptyDataObject : jQuery.isEmptyObject )( thisCache ) ) {
        return;
      }
    }
  }

See jQuery.data for more information

  if ( !pvt ) {
    delete cache[ id ].data;

Don't destroy the parent cache unless the internal data object had been the only thing left in it

    if ( !isEmptyDataObject( cache[ id ] ) ) {
      return;
    }
  }

Destroy the cache

  if ( isNode ) {
    jQuery.cleanData( [ elem ], true );

Use delete when supported for expandos or cache is not a window per isWindow (#10080)

  } else if ( jQuery.support.deleteExpando || cache != cache.window ) {
    delete cache[ id ];

When all else fails, null

  } else {
    cache[ id ] = null;
  }
}

jQuery.extend({
  cache: {},

Unique for each copy of jQuery on the page Non-digits removed to match rinlinejQuery

  expando: "jQuery" + ( core_version + Math.random() ).replace( /\D/g, "" ),

The following elements throw uncatchable exceptions if you attempt to add expando properties to them.

  noData: {
    "embed": true,

Ban all objects except for Flash (which handle expandos)

    "object": "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000",
    "applet": true
  },

  hasData: function( elem ) {
    elem = elem.nodeType ? jQuery.cache[ elem[jQuery.expando] ] : elem[ jQuery.expando ];
    return !!elem && !isEmptyDataObject( elem );
  },

  data: function( elem, name, data ) {
    return internalData( elem, name, data );
  },

  removeData: function( elem, name ) {
    return internalRemoveData( elem, name );
  },

For internal use only.

  _data: function( elem, name, data ) {
    return internalData( elem, name, data, true );
  },

  _removeData: function( elem, name ) {
    return internalRemoveData( elem, name, true );
  },

A method for determining if a DOM node can handle the data expando

  acceptData: function( elem ) {

Do not set data on non-element because it will not be cleared (#8335).

    if ( elem.nodeType && elem.nodeType !== 1 && elem.nodeType !== 9 ) {
      return false;
    }

    var noData = elem.nodeName && jQuery.noData[ elem.nodeName.toLowerCase() ];

nodes accept data unless otherwise specified; rejection can be conditional

    return !noData || noData !== true && elem.getAttribute("classid") === noData;
  }
});

jQuery.fn.extend({
  data: function( key, value ) {
    var attrs, name,
      elem = this[0],
      i = 0,
      data = null;

Gets all values

    if ( key === undefined ) {
      if ( this.length ) {
        data = jQuery.data( elem );

        if ( elem.nodeType === 1 && !jQuery._data( elem, "parsedAttrs" ) ) {
          attrs = elem.attributes;
          for ( ; i < attrs.length; i++ ) {
            name = attrs[i].name;

            if ( !name.indexOf( "data-" ) ) {
              name = jQuery.camelCase( name.slice(5) );

              dataAttr( elem, name, data[ name ] );
            }
          }
          jQuery._data( elem, "parsedAttrs", true );
        }
      }

      return data;
    }

Sets multiple values

    if ( typeof key === "object" ) {
      return this.each(function() {
        jQuery.data( this, key );
      });
    }

    return jQuery.access( this, function( value ) {

      if ( value === undefined ) {

Try to fetch any internally stored data first

        return elem ? dataAttr( elem, key, jQuery.data( elem, key ) ) : null;
      }

      this.each(function() {
        jQuery.data( this, key, value );
      });
    }, null, value, arguments.length > 1, null, true );
  },

  removeData: function( key ) {
    return this.each(function() {
      jQuery.removeData( this, key );
    });
  }
});

function dataAttr( elem, key, data ) {

If nothing was found internally, try to fetch any data from the HTML5 data-* attribute

  if ( data === undefined && elem.nodeType === 1 ) {

    var name = "data-" + key.replace( rmultiDash, "-$1" ).toLowerCase();

    data = elem.getAttribute( name );

    if ( typeof data === "string" ) {
      try {
        data = data === "true" ? true :
          data === "false" ? false :
          data === "null" ? null :

Only convert to a number if it doesn't change the string

          +data + "" === data ? +data :
          rbrace.test( data ) ? jQuery.parseJSON( data ) :
            data;
      } catch( e ) {}

Make sure we set the data so it isn't changed later

      jQuery.data( elem, key, data );

    } else {
      data = undefined;
    }
  }

  return data;
}

checks a cache object for emptiness

function isEmptyDataObject( obj ) {
  var name;
  for ( name in obj ) {

if the public data object is empty, the private is still empty

    if ( name === "data" && jQuery.isEmptyObject( obj[name] ) ) {
      continue;
    }
    if ( name !== "toJSON" ) {
      return false;
    }
  }

  return true;
}
jQuery.extend({
  queue: function( elem, type, data ) {
    var queue;

    if ( elem ) {
      type = ( type || "fx" ) + "queue";
      queue = jQuery._data( elem, type );

Speed up dequeue by getting out quickly if this is just a lookup

      if ( data ) {
        if ( !queue || jQuery.isArray(data) ) {
          queue = jQuery._data( elem, type, jQuery.makeArray(data) );
        } else {
          queue.push( data );
        }
      }
      return queue || [];
    }
  },

  dequeue: function( elem, type ) {
    type = type || "fx";

    var queue = jQuery.queue( elem, type ),
      startLength = queue.length,
      fn = queue.shift(),
      hooks = jQuery._queueHooks( elem, type ),
      next = function() {
        jQuery.dequeue( elem, type );
      };

If the fx queue is dequeued, always remove the progress sentinel

    if ( fn === "inprogress" ) {
      fn = queue.shift();
      startLength--;
    }

    hooks.cur = fn;
    if ( fn ) {

Add a progress sentinel to prevent the fx queue from being automatically dequeued

      if ( type === "fx" ) {
        queue.unshift( "inprogress" );
      }

clear up the last queue stop function

      delete hooks.stop;
      fn.call( elem, next, hooks );
    }

    if ( !startLength && hooks ) {
      hooks.empty.fire();
    }
  },

not intended for public consumption - generates a queueHooks object, or returns the current one

  _queueHooks: function( elem, type ) {
    var key = type + "queueHooks";
    return jQuery._data( elem, key ) || jQuery._data( elem, key, {
      empty: jQuery.Callbacks("once memory").add(function() {
        jQuery._removeData( elem, type + "queue" );
        jQuery._removeData( elem, key );
      })
    });
  }
});

jQuery.fn.extend({
  queue: function( type, data ) {
    var setter = 2;

    if ( typeof type !== "string" ) {
      data = type;
      type = "fx";
      setter--;
    }

    if ( arguments.length < setter ) {
      return jQuery.queue( this[0], type );
    }

    return data === undefined ?
      this :
      this.each(function() {
        var queue = jQuery.queue( this, type, data );

ensure a hooks for this queue

        jQuery._queueHooks( this, type );

        if ( type === "fx" && queue[0] !== "inprogress" ) {
          jQuery.dequeue( this, type );
        }
      });
  },
  dequeue: function( type ) {
    return this.each(function() {
      jQuery.dequeue( this, type );
    });
  },

Based off of the plugin by Clint Helfers, with permission. http://blindsignals.com/index.php/2009/07/jquery-delay/

  delay: function( time, type ) {
    time = jQuery.fx ? jQuery.fx.speeds[ time ] || time : time;
    type = type || "fx";

    return this.queue( type, function( next, hooks ) {
      var timeout = setTimeout( next, time );
      hooks.stop = function() {
        clearTimeout( timeout );
      };
    });
  },
  clearQueue: function( type ) {
    return this.queue( type || "fx", [] );
  },

Get a promise resolved when queues of a certain type are emptied (fx is the type by default)

  promise: function( type, obj ) {
    var tmp,
      count = 1,
      defer = jQuery.Deferred(),
      elements = this,
      i = this.length,
      resolve = function() {
        if ( !( --count ) ) {
          defer.resolveWith( elements, [ elements ] );
        }
      };

    if ( typeof type !== "string" ) {
      obj = type;
      type = undefined;
    }
    type = type || "fx";

    while( i-- ) {
      tmp = jQuery._data( elements[ i ], type + "queueHooks" );
      if ( tmp && tmp.empty ) {
        count++;
        tmp.empty.add( resolve );
      }
    }
    resolve();
    return defer.promise( obj );
  }
});
var nodeHook, boolHook,
  rclass = /[\t\r\n]/g,
  rreturn = /\r/g,
  rfocusable = /^(?:input|select|textarea|button|object)$/i,
  rclickable = /^(?:a|area)$/i,
  rboolean = /^(?:checked|selected|autofocus|autoplay|async|controls|defer|disabled|hidden|loop|multiple|open|readonly|required|scoped)$/i,
  ruseDefault = /^(?:checked|selected)$/i,
  getSetAttribute = jQuery.support.getSetAttribute,
  getSetInput = jQuery.support.input;

jQuery.fn.extend({
  attr: function( name, value ) {
    return jQuery.access( this, jQuery.attr, name, value, arguments.length > 1 );
  },

  removeAttr: function( name ) {
    return this.each(function() {
      jQuery.removeAttr( this, name );
    });
  },

  prop: function( name, value ) {
    return jQuery.access( this, jQuery.prop, name, value, arguments.length > 1 );
  },

  removeProp: function( name ) {
    name = jQuery.propFix[ name ] || name;
    return this.each(function() {

try/catch handles cases where IE balks (such as removing a property on window)

      try {
        this[ name ] = undefined;
        delete this[ name ];
      } catch( e ) {}
    });
  },

  addClass: function( value ) {
    var classes, elem, cur, clazz, j,
      i = 0,
      len = this.length,
      proceed = typeof value === "string" && value;

    if ( jQuery.isFunction( value ) ) {
      return this.each(function( j ) {
        jQuery( this ).addClass( value.call( this, j, this.className ) );
      });
    }

    if ( proceed ) {

The disjunction here is for better compressibility (see removeClass)

      classes = ( value || "" ).match( core_rnotwhite ) || [];

      for ( ; i < len; i++ ) {
        elem = this[ i ];
        cur = elem.nodeType === 1 && ( elem.className ?
          ( " " + elem.className + " " ).replace( rclass, " " ) :
          " "
        );

        if ( cur ) {
          j = 0;
          while ( (clazz = classes[j++]) ) {
            if ( cur.indexOf( " " + clazz + " " ) < 0 ) {
              cur += clazz + " ";
            }
          }
          elem.className = jQuery.trim( cur );

        }
      }
    }

    return this;
  },

  removeClass: function( value ) {
    var classes, elem, cur, clazz, j,
      i = 0,
      len = this.length,
      proceed = arguments.length === 0 || typeof value === "string" && value;

    if ( jQuery.isFunction( value ) ) {
      return this.each(function( j ) {
        jQuery( this ).removeClass( value.call( this, j, this.className ) );
      });
    }
    if ( proceed ) {
      classes = ( value || "" ).match( core_rnotwhite ) || [];

      for ( ; i < len; i++ ) {
        elem = this[ i ];

This expression is here for better compressibility (see addClass)

        cur = elem.nodeType === 1 && ( elem.className ?
          ( " " + elem.className + " " ).replace( rclass, " " ) :
          ""
        );

        if ( cur ) {
          j = 0;
          while ( (clazz = classes[j++]) ) {

Remove all instances

            while ( cur.indexOf( " " + clazz + " " ) >= 0 ) {
              cur = cur.replace( " " + clazz + " ", " " );
            }
          }
          elem.className = value ? jQuery.trim( cur ) : "";
        }
      }
    }

    return this;
  },

  toggleClass: function( value, stateVal ) {
    var type = typeof value,
      isBool = typeof stateVal === "boolean";

    if ( jQuery.isFunction( value ) ) {
      return this.each(function( i ) {
        jQuery( this ).toggleClass( value.call(this, i, this.className, stateVal), stateVal );
      });
    }

    return this.each(function() {
      if ( type === "string" ) {

toggle individual class names

        var className,
          i = 0,
          self = jQuery( this ),
          state = stateVal,
          classNames = value.match( core_rnotwhite ) || [];

        while ( (className = classNames[ i++ ]) ) {

check each className given, space separated list

          state = isBool ? state : !self.hasClass( className );
          self[ state ? "addClass" : "removeClass" ]( className );
        }

Toggle whole class name

      } else if ( type === core_strundefined || type === "boolean" ) {
        if ( this.className ) {

store className if set

          jQuery._data( this, "__className__", this.className );
        }

If the element has a class name or if we're passed "false", then remove the whole classname (if there was one, the above saved it). Otherwise bring back whatever was previously saved (if anything), falling back to the empty string if nothing was stored.

        this.className = this.className || value === false ? "" : jQuery._data( this, "__className__" ) || "";
      }
    });
  },

  hasClass: function( selector ) {
    var className = " " + selector + " ",
      i = 0,
      l = this.length;
    for ( ; i < l; i++ ) {
      if ( this[i].nodeType === 1 && (" " + this[i].className + " ").replace(rclass, " ").indexOf( className ) >= 0 ) {
        return true;
      }
    }

    return false;
  },

  val: function( value ) {
    var ret, hooks, isFunction,
      elem = this[0];

    if ( !arguments.length ) {
      if ( elem ) {
        hooks = jQuery.valHooks[ elem.type ] || jQuery.valHooks[ elem.nodeName.toLowerCase() ];

        if ( hooks && "get" in hooks && (ret = hooks.get( elem, "value" )) !== undefined ) {
          return ret;
        }

        ret = elem.value;

        return typeof ret === "string" ?

handle most common string cases

          ret.replace(rreturn, "") :

handle cases where value is null/undef or number

          ret == null ? "" : ret;
      }

      return;
    }

    isFunction = jQuery.isFunction( value );

    return this.each(function( i ) {
      var val,
        self = jQuery(this);

      if ( this.nodeType !== 1 ) {
        return;
      }

      if ( isFunction ) {
        val = value.call( this, i, self.val() );
      } else {
        val = value;
      }

Treat null/undefined as ""; convert numbers to string

      if ( val == null ) {
        val = "";
      } else if ( typeof val === "number" ) {
        val += "";
      } else if ( jQuery.isArray( val ) ) {
        val = jQuery.map(val, function ( value ) {
          return value == null ? "" : value + "";
        });
      }

      hooks = jQuery.valHooks[ this.type ] || jQuery.valHooks[ this.nodeName.toLowerCase() ];

If set returns undefined, fall back to normal setting

      if ( !hooks || !("set" in hooks) || hooks.set( this, val, "value" ) === undefined ) {
        this.value = val;
      }
    });
  }
});

jQuery.extend({
  valHooks: {
    option: {
      get: function( elem ) {

attributes.value is undefined in Blackberry 4.7 but uses .value. See #6932

        var val = elem.attributes.value;
        return !val || val.specified ? elem.value : elem.text;
      }
    },
    select: {
      get: function( elem ) {
        var value, option,
          options = elem.options,
          index = elem.selectedIndex,
          one = elem.type === "select-one" || index < 0,
          values = one ? null : [],
          max = one ? index + 1 : options.length,
          i = index < 0 ?
            max :
            one ? index : 0;

Loop through all the selected options

        for ( ; i < max; i++ ) {
          option = options[ i ];

oldIE doesn't update selected after form reset (#2551)

          if ( ( option.selected || i === index ) &&

Don't return options that are disabled or in a disabled optgroup

              ( jQuery.support.optDisabled ? !option.disabled : option.getAttribute("disabled") === null ) &&
              ( !option.parentNode.disabled || !jQuery.nodeName( option.parentNode, "optgroup" ) ) ) {

Get the specific value for the option

            value = jQuery( option ).val();

We don't need an array for one selects

            if ( one ) {
              return value;
            }

Multi-Selects return an array

            values.push( value );
          }
        }

        return values;
      },

      set: function( elem, value ) {
        var values = jQuery.makeArray( value );

        jQuery(elem).find("option").each(function() {
          this.selected = jQuery.inArray( jQuery(this).val(), values ) >= 0;
        });

        if ( !values.length ) {
          elem.selectedIndex = -1;
        }
        return values;
      }
    }
  },

  attr: function( elem, name, value ) {
    var hooks, notxml, ret,
      nType = elem.nodeType;

don't get/set attributes on text, comment and attribute nodes

    if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {
      return;
    }

Fallback to prop when attributes are not supported

    if ( typeof elem.getAttribute === core_strundefined ) {
      return jQuery.prop( elem, name, value );
    }

    notxml = nType !== 1 || !jQuery.isXMLDoc( elem );

All attributes are lowercase Grab necessary hook if one is defined

    if ( notxml ) {
      name = name.toLowerCase();
      hooks = jQuery.attrHooks[ name ] || ( rboolean.test( name ) ? boolHook : nodeHook );
    }

    if ( value !== undefined ) {

      if ( value === null ) {
        jQuery.removeAttr( elem, name );

      } else if ( hooks && notxml && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ) {
        return ret;

      } else {
        elem.setAttribute( name, value + "" );
        return value;
      }

    } else if ( hooks && notxml && "get" in hooks && (ret = hooks.get( elem, name )) !== null ) {
      return ret;

    } else {

In IE9+, Flash objects don't have .getAttribute (#12945) Support: IE9+

      if ( typeof elem.getAttribute !== core_strundefined ) {
        ret =  elem.getAttribute( name );
      }

Non-existent attributes return null, we normalize to undefined

      return ret == null ?
        undefined :
        ret;
    }
  },

  removeAttr: function( elem, value ) {
    var name, propName,
      i = 0,
      attrNames = value && value.match( core_rnotwhite );

    if ( attrNames && elem.nodeType === 1 ) {
      while ( (name = attrNames[i++]) ) {
        propName = jQuery.propFix[ name ] || name;

Boolean attributes get special treatment (#10870)

        if ( rboolean.test( name ) ) {

Set corresponding property to false for boolean attributes Also clear defaultChecked/defaultSelected (if appropriate) for IE<8

          if ( !getSetAttribute && ruseDefault.test( name ) ) {
            elem[ jQuery.camelCase( "default-" + name ) ] =
              elem[ propName ] = false;
          } else {
            elem[ propName ] = false;
          }

See #9699 for explanation of this approach (setting first, then removal)

        } else {
          jQuery.attr( elem, name, "" );
        }

        elem.removeAttribute( getSetAttribute ? name : propName );
      }
    }
  },

  attrHooks: {
    type: {
      set: function( elem, value ) {
        if ( !jQuery.support.radioValue && value === "radio" && jQuery.nodeName(elem, "input") ) {

Setting the type on a radio button after the value resets the value in IE6-9 Reset value to default in case type is set after value during creation

          var val = elem.value;
          elem.setAttribute( "type", value );
          if ( val ) {
            elem.value = val;
          }
          return value;
        }
      }
    }
  },

  propFix: {
    tabindex: "tabIndex",
    readonly: "readOnly",
    "for": "htmlFor",
    "class": "className",
    maxlength: "maxLength",
    cellspacing: "cellSpacing",
    cellpadding: "cellPadding",
    rowspan: "rowSpan",
    colspan: "colSpan",
    usemap: "useMap",
    frameborder: "frameBorder",
    contenteditable: "contentEditable"
  },

  prop: function( elem, name, value ) {
    var ret, hooks, notxml,
      nType = elem.nodeType;

don't get/set properties on text, comment and attribute nodes

    if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {
      return;
    }

    notxml = nType !== 1 || !jQuery.isXMLDoc( elem );

    if ( notxml ) {

Fix name and attach hooks

      name = jQuery.propFix[ name ] || name;
      hooks = jQuery.propHooks[ name ];
    }

    if ( value !== undefined ) {
      if ( hooks && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ) {
        return ret;

      } else {
        return ( elem[ name ] = value );
      }

    } else {
      if ( hooks && "get" in hooks && (ret = hooks.get( elem, name )) !== null ) {
        return ret;

      } else {
        return elem[ name ];
      }
    }
  },

  propHooks: {
    tabIndex: {
      get: function( elem ) {

elem.tabIndex doesn't always return the correct value when it hasn't been explicitly set http://fluidproject.org/blog/2008/01/09/getting-setting-and-removing-tabindex-values-with-javascript/

        var attributeNode = elem.getAttributeNode("tabindex");

        return attributeNode && attributeNode.specified ?
          parseInt( attributeNode.value, 10 ) :
          rfocusable.test( elem.nodeName ) || rclickable.test( elem.nodeName ) && elem.href ?
            0 :
            undefined;
      }
    }
  }
});

Hook for boolean attributes

boolHook = {
  get: function( elem, name ) {
    var

Use .prop to determine if this attribute is understood as boolean

      prop = jQuery.prop( elem, name ),

Fetch it accordingly

      attr = typeof prop === "boolean" && elem.getAttribute( name ),
      detail = typeof prop === "boolean" ?

        getSetInput && getSetAttribute ?
          attr != null :

oldIE fabricates an empty string for missing boolean attributes and conflates checked/selected into attroperties

          ruseDefault.test( name ) ?
            elem[ jQuery.camelCase( "default-" + name ) ] :
            !!attr :

fetch an attribute node for properties not recognized as boolean

        elem.getAttributeNode( name );

    return detail && detail.value !== false ?
      name.toLowerCase() :
      undefined;
  },
  set: function( elem, value, name ) {
    if ( value === false ) {

Remove boolean attributes when set to false

      jQuery.removeAttr( elem, name );
    } else if ( getSetInput && getSetAttribute || !ruseDefault.test( name ) ) {

IE<8 needs the property name

      elem.setAttribute( !getSetAttribute && jQuery.propFix[ name ] || name, name );

Use defaultChecked and defaultSelected for oldIE

    } else {
      elem[ jQuery.camelCase( "default-" + name ) ] = elem[ name ] = true;
    }

    return name;
  }
};

fix oldIE value attroperty

if ( !getSetInput || !getSetAttribute ) {
  jQuery.attrHooks.value = {
    get: function( elem, name ) {
      var ret = elem.getAttributeNode( name );
      return jQuery.nodeName( elem, "input" ) ?

Ignore the value property by using defaultValue

        elem.defaultValue :

        ret && ret.specified ? ret.value : undefined;
    },
    set: function( elem, value, name ) {
      if ( jQuery.nodeName( elem, "input" ) ) {

Does not return so that setAttribute is also used

        elem.defaultValue = value;
      } else {

Use nodeHook if defined (#1954); otherwise setAttribute is fine

        return nodeHook && nodeHook.set( elem, value, name );
      }
    }
  };
}

IE6/7 do not support getting/setting some attributes with get/setAttribute

if ( !getSetAttribute ) {

Use this for any attribute in IE6/7 This fixes almost every IE6/7 issue

  nodeHook = jQuery.valHooks.button = {
    get: function( elem, name ) {
      var ret = elem.getAttributeNode( name );
      return ret && ( name === "id" || name === "name" || name === "coords" ? ret.value !== "" : ret.specified ) ?
        ret.value :
        undefined;
    },
    set: function( elem, value, name ) {

Set the existing or create a new attribute node

      var ret = elem.getAttributeNode( name );
      if ( !ret ) {
        elem.setAttributeNode(
          (ret = elem.ownerDocument.createAttribute( name ))
        );
      }

      ret.value = value += "";

Break association with cloned elements by also using setAttribute (#9646)

      return name === "value" || value === elem.getAttribute( name ) ?
        value :
        undefined;
    }
  };

Set contenteditable to false on removals(#10429) Setting to empty string throws an error as an invalid value

  jQuery.attrHooks.contenteditable = {
    get: nodeHook.get,
    set: function( elem, value, name ) {
      nodeHook.set( elem, value === "" ? false : value, name );
    }
  };

Set width and height to auto instead of 0 on empty string( Bug #8150 ) This is for removals

  jQuery.each([ "width", "height" ], function( i, name ) {
    jQuery.attrHooks[ name ] = jQuery.extend( jQuery.attrHooks[ name ], {
      set: function( elem, value ) {
        if ( value === "" ) {
          elem.setAttribute( name, "auto" );
          return value;
        }
      }
    });
  });
}

Some attributes require a special call on IE http://msdn.microsoft.com/en-us/library/ms536429%28VS.85%29.aspx

if ( !jQuery.support.hrefNormalized ) {
  jQuery.each([ "href", "src", "width", "height" ], function( i, name ) {
    jQuery.attrHooks[ name ] = jQuery.extend( jQuery.attrHooks[ name ], {
      get: function( elem ) {
        var ret = elem.getAttribute( name, 2 );
        return ret == null ? undefined : ret;
      }
    });
  });

href/src property should get the full normalized URL (#10299/#12915)

  jQuery.each([ "href", "src" ], function( i, name ) {
    jQuery.propHooks[ name ] = {
      get: function( elem ) {
        return elem.getAttribute( name, 4 );
      }
    };
  });
}

if ( !jQuery.support.style ) {
  jQuery.attrHooks.style = {
    get: function( elem ) {

Return undefined in the case of empty string Note: IE uppercases css property names, but if we were to .toLowerCase() .cssText, that would destroy case senstitivity in URL's, like in "background"

      return elem.style.cssText || undefined;
    },
    set: function( elem, value ) {
      return ( elem.style.cssText = value + "" );
    }
  };
}

Safari mis-reports the default selected property of an option Accessing the parent's selectedIndex property fixes it

if ( !jQuery.support.optSelected ) {
  jQuery.propHooks.selected = jQuery.extend( jQuery.propHooks.selected, {
    get: function( elem ) {
      var parent = elem.parentNode;

      if ( parent ) {
        parent.selectedIndex;

Make sure that it also works with optgroups, see #5701

        if ( parent.parentNode ) {
          parent.parentNode.selectedIndex;
        }
      }
      return null;
    }
  });
}

IE6/7 call enctype encoding

if ( !jQuery.support.enctype ) {
  jQuery.propFix.enctype = "encoding";
}

Radios and checkboxes getter/setter

if ( !jQuery.support.checkOn ) {
  jQuery.each([ "radio", "checkbox" ], function() {
    jQuery.valHooks[ this ] = {
      get: function( elem ) {

Handle the case where in Webkit "" is returned instead of "on" if a value isn't specified

        return elem.getAttribute("value") === null ? "on" : elem.value;
      }
    };
  });
}
jQuery.each([ "radio", "checkbox" ], function() {
  jQuery.valHooks[ this ] = jQuery.extend( jQuery.valHooks[ this ], {
    set: function( elem, value ) {
      if ( jQuery.isArray( value ) ) {
        return ( elem.checked = jQuery.inArray( jQuery(elem).val(), value ) >= 0 );
      }
    }
  });
});
var rformElems = /^(?:input|select|textarea)$/i,
  rkeyEvent = /^key/,
  rmouseEvent = /^(?:mouse|contextmenu)|click/,
  rfocusMorph = /^(?:focusinfocus|focusoutblur)$/,
  rtypenamespace = /^([^.]*)(?:\.(.+)|)$/;

function returnTrue() {
  return true;
}

function returnFalse() {
  return false;
}

Helper functions for managing events -- not part of the public interface. Props to Dean Edwards' addEvent library for many of the ideas.

jQuery.event = {

  global: {},

  add: function( elem, types, handler, data, selector ) {
    var tmp, events, t, handleObjIn,
      special, eventHandle, handleObj,
      handlers, type, namespaces, origType,
      elemData = jQuery._data( elem );

Don't attach events to noData or text/comment nodes (but allow plain objects)

    if ( !elemData ) {
      return;
    }

Caller can pass in an object of custom data in lieu of the handler

    if ( handler.handler ) {
      handleObjIn = handler;
      handler = handleObjIn.handler;
      selector = handleObjIn.selector;
    }

Make sure that the handler has a unique ID, used to find/remove it later

    if ( !handler.guid ) {
      handler.guid = jQuery.guid++;
    }

Init the element's event structure and main handler, if this is the first

    if ( !(events = elemData.events) ) {
      events = elemData.events = {};
    }
    if ( !(eventHandle = elemData.handle) ) {
      eventHandle = elemData.handle = function( e ) {

Discard the second event of a jQuery.event.trigger() and when an event is called after a page has unloaded

        return typeof jQuery !== core_strundefined && (!e || jQuery.event.triggered !== e.type) ?
          jQuery.event.dispatch.apply( eventHandle.elem, arguments ) :
          undefined;
      };

Add elem as a property of the handle fn to prevent a memory leak with IE non-native events

      eventHandle.elem = elem;
    }

Handle multiple events separated by a space jQuery(...).bind("mouseover mouseout", fn);

    types = ( types || "" ).match( core_rnotwhite ) || [""];
    t = types.length;
    while ( t-- ) {
      tmp = rtypenamespace.exec( types[t] ) || [];
      type = origType = tmp[1];
      namespaces = ( tmp[2] || "" ).split( "." ).sort();

If event changes its type, use the special event handlers for the changed type

      special = jQuery.event.special[ type ] || {};

If selector defined, determine special event api type, otherwise given type

      type = ( selector ? special.delegateType : special.bindType ) || type;

Update special based on newly reset type

      special = jQuery.event.special[ type ] || {};

handleObj is passed to all event handlers

      handleObj = jQuery.extend({
        type: type,
        origType: origType,
        data: data,
        handler: handler,
        guid: handler.guid,
        selector: selector,
        needsContext: selector && jQuery.expr.match.needsContext.test( selector ),
        namespace: namespaces.join(".")
      }, handleObjIn );

Init the event handler queue if we're the first

      if ( !(handlers = events[ type ]) ) {
        handlers = events[ type ] = [];
        handlers.delegateCount = 0;

Only use addEventListener/attachEvent if the special events handler returns false

        if ( !special.setup || special.setup.call( elem, data, namespaces, eventHandle ) === false ) {

Bind the global event handler to the element

          if ( elem.addEventListener ) {
            elem.addEventListener( type, eventHandle, false );

          } else if ( elem.attachEvent ) {
            elem.attachEvent( "on" + type, eventHandle );
          }
        }
      }

      if ( special.add ) {
        special.add.call( elem, handleObj );

        if ( !handleObj.handler.guid ) {
          handleObj.handler.guid = handler.guid;
        }
      }

Add to the element's handler list, delegates in front

      if ( selector ) {
        handlers.splice( handlers.delegateCount++, 0, handleObj );
      } else {
        handlers.push( handleObj );
      }

Keep track of which events have ever been used, for event optimization

      jQuery.event.global[ type ] = true;
    }

Nullify elem to prevent memory leaks in IE

    elem = null;
  },

Detach an event or set of events from an element

  remove: function( elem, types, handler, selector, mappedTypes ) {
    var j, handleObj, tmp,
      origCount, t, events,
      special, handlers, type,
      namespaces, origType,
      elemData = jQuery.hasData( elem ) && jQuery._data( elem );

    if ( !elemData || !(events = elemData.events) ) {
      return;
    }

Once for each type.namespace in types; type may be omitted

    types = ( types || "" ).match( core_rnotwhite ) || [""];
    t = types.length;
    while ( t-- ) {
      tmp = rtypenamespace.exec( types[t] ) || [];
      type = origType = tmp[1];
      namespaces = ( tmp[2] || "" ).split( "." ).sort();

Unbind all events (on this namespace, if provided) for the element

      if ( !type ) {
        for ( type in events ) {
          jQuery.event.remove( elem, type + types[ t ], handler, selector, true );
        }
        continue;
      }

      special = jQuery.event.special[ type ] || {};
      type = ( selector ? special.delegateType : special.bindType ) || type;
      handlers = events[ type ] || [];
      tmp = tmp[2] && new RegExp( "(^|\\.)" + namespaces.join("\\.(?:.*\\.|)") + "(\\.|$)" );

Remove matching events

      origCount = j = handlers.length;
      while ( j-- ) {
        handleObj = handlers[ j ];

        if ( ( mappedTypes || origType === handleObj.origType ) &&
          ( !handler || handler.guid === handleObj.guid ) &&
          ( !tmp || tmp.test( handleObj.namespace ) ) &&
          ( !selector || selector === handleObj.selector || selector === "**" && handleObj.selector ) ) {
          handlers.splice( j, 1 );

          if ( handleObj.selector ) {
            handlers.delegateCount--;
          }
          if ( special.remove ) {
            special.remove.call( elem, handleObj );
          }
        }
      }

Remove generic event handler if we removed something and no more handlers exist (avoids potential for endless recursion during removal of special event handlers)

      if ( origCount && !handlers.length ) {
        if ( !special.teardown || special.teardown.call( elem, namespaces, elemData.handle ) === false ) {
          jQuery.removeEvent( elem, type, elemData.handle );
        }

        delete events[ type ];
      }
    }

Remove the expando if it's no longer used

    if ( jQuery.isEmptyObject( events ) ) {
      delete elemData.handle;

removeData also checks for emptiness and clears the expando if empty so use it instead of delete

      jQuery._removeData( elem, "events" );
    }
  },

  trigger: function( event, data, elem, onlyHandlers ) {
    var handle, ontype, cur,
      bubbleType, special, tmp, i,
      eventPath = [ elem || document ],
      type = core_hasOwn.call( event, "type" ) ? event.type : event,
      namespaces = core_hasOwn.call( event, "namespace" ) ? event.namespace.split(".") : [];

    cur = tmp = elem = elem || document;

Don't do events on text and comment nodes

    if ( elem.nodeType === 3 || elem.nodeType === 8 ) {
      return;
    }

focus/blur morphs to focusin/out; ensure we're not firing them right now

    if ( rfocusMorph.test( type + jQuery.event.triggered ) ) {
      return;
    }

    if ( type.indexOf(".") >= 0 ) {

Namespaced trigger; create a regexp to match event type in handle()

      namespaces = type.split(".");
      type = namespaces.shift();
      namespaces.sort();
    }
    ontype = type.indexOf(":") < 0 && "on" + type;

Caller can pass in a jQuery.Event object, Object, or just an event type string

    event = event[ jQuery.expando ] ?
      event :
      new jQuery.Event( type, typeof event === "object" && event );

    event.isTrigger = true;
    event.namespace = namespaces.join(".");
    event.namespace_re = event.namespace ?
      new RegExp( "(^|\\.)" + namespaces.join("\\.(?:.*\\.|)") + "(\\.|$)" ) :
      null;

Clean up the event in case it is being reused

    event.result = undefined;
    if ( !event.target ) {
      event.target = elem;
    }

Clone any incoming data and prepend the event, creating the handler arg list

    data = data == null ?
      [ event ] :
      jQuery.makeArray( data, [ event ] );

Allow special events to draw outside the lines

    special = jQuery.event.special[ type ] || {};
    if ( !onlyHandlers && special.trigger && special.trigger.apply( elem, data ) === false ) {
      return;
    }

Determine event propagation path in advance, per W3C events spec (#9951) Bubble up to document, then to window; watch for a global ownerDocument var (#9724)

    if ( !onlyHandlers && !special.noBubble && !jQuery.isWindow( elem ) ) {

      bubbleType = special.delegateType || type;
      if ( !rfocusMorph.test( bubbleType + type ) ) {
        cur = cur.parentNode;
      }
      for ( ; cur; cur = cur.parentNode ) {
        eventPath.push( cur );
        tmp = cur;
      }

Only add window if we got to document (e.g., not plain obj or detached DOM)

      if ( tmp === (elem.ownerDocument || document) ) {
        eventPath.push( tmp.defaultView || tmp.parentWindow || window );
      }
    }

Fire handlers on the event path

    i = 0;
    while ( (cur = eventPath[i++]) && !event.isPropagationStopped() ) {

      event.type = i > 1 ?
        bubbleType :
        special.bindType || type;

jQuery handler

      handle = ( jQuery._data( cur, "events" ) || {} )[ event.type ] && jQuery._data( cur, "handle" );
      if ( handle ) {
        handle.apply( cur, data );
      }

Native handler

      handle = ontype && cur[ ontype ];
      if ( handle && jQuery.acceptData( cur ) && handle.apply && handle.apply( cur, data ) === false ) {
        event.preventDefault();
      }
    }
    event.type = type;

If nobody prevented the default action, do it now

    if ( !onlyHandlers && !event.isDefaultPrevented() ) {

      if ( (!special._default || special._default.apply( elem.ownerDocument, data ) === false) &&
        !(type === "click" && jQuery.nodeName( elem, "a" )) && jQuery.acceptData( elem ) ) {

Call a native DOM method on the target with the same name name as the event. Can't use an .isFunction() check here because IE6/7 fails that test. Don't do default actions on window, that's where global variables be (#6170)

        if ( ontype && elem[ type ] && !jQuery.isWindow( elem ) ) {

Don't re-trigger an onFOO event when we call its FOO() method

          tmp = elem[ ontype ];

          if ( tmp ) {
            elem[ ontype ] = null;
          }

Prevent re-triggering of the same event, since we already bubbled it above

          jQuery.event.triggered = type;
          try {
            elem[ type ]();
          } catch ( e ) {

IE<9 dies on focus/blur to hidden element (#1486,#12518) only reproducible on winXP IE8 native, not IE9 in IE8 mode

          }
          jQuery.event.triggered = undefined;

          if ( tmp ) {
            elem[ ontype ] = tmp;
          }
        }
      }
    }

    return event.result;
  },

  dispatch: function( event ) {

Make a writable jQuery.Event from the native event object

    event = jQuery.event.fix( event );

    var i, ret, handleObj, matched, j,
      handlerQueue = [],
      args = core_slice.call( arguments ),
      handlers = ( jQuery._data( this, "events" ) || {} )[ event.type ] || [],
      special = jQuery.event.special[ event.type ] || {};

Use the fix-ed jQuery.Event rather than the (read-only) native event

    args[0] = event;
    event.delegateTarget = this;

Call the preDispatch hook for the mapped type, and let it bail if desired

    if ( special.preDispatch && special.preDispatch.call( this, event ) === false ) {
      return;
    }

Determine handlers

    handlerQueue = jQuery.event.handlers.call( this, event, handlers );

Run delegates first; they may want to stop propagation beneath us

    i = 0;
    while ( (matched = handlerQueue[ i++ ]) && !event.isPropagationStopped() ) {
      event.currentTarget = matched.elem;

      j = 0;
      while ( (handleObj = matched.handlers[ j++ ]) && !event.isImmediatePropagationStopped() ) {

Triggered event must either 1) have no namespace, or 2) have namespace(s) a subset or equal to those in the bound event (both can have no namespace).

        if ( !event.namespace_re || event.namespace_re.test( handleObj.namespace ) ) {

          event.handleObj = handleObj;
          event.data = handleObj.data;

          ret = ( (jQuery.event.special[ handleObj.origType ] || {}).handle || handleObj.handler )
              .apply( matched.elem, args );

          if ( ret !== undefined ) {
            if ( (event.result = ret) === false ) {
              event.preventDefault();
              event.stopPropagation();
            }
          }
        }
      }
    }

Call the postDispatch hook for the mapped type

    if ( special.postDispatch ) {
      special.postDispatch.call( this, event );
    }

    return event.result;
  },

  handlers: function( event, handlers ) {
    var sel, handleObj, matches, i,
      handlerQueue = [],
      delegateCount = handlers.delegateCount,
      cur = event.target;

Find delegate handlers Black-hole SVG <use> instance trees (#13180) Avoid non-left-click bubbling in Firefox (#3861)

    if ( delegateCount && cur.nodeType && (!event.button || event.type !== "click") ) {

      for ( ; cur != this; cur = cur.parentNode || this ) {

Don't check non-elements (#13208) Don't process clicks on disabled elements (#6911, #8165, #11382, #11764)

        if ( cur.nodeType === 1 && (cur.disabled !== true || event.type !== "click") ) {
          matches = [];
          for ( i = 0; i < delegateCount; i++ ) {
            handleObj = handlers[ i ];

Don't conflict with Object.prototype properties (#13203)

            sel = handleObj.selector + " ";

            if ( matches[ sel ] === undefined ) {
              matches[ sel ] = handleObj.needsContext ?
                jQuery( sel, this ).index( cur ) >= 0 :
                jQuery.find( sel, this, null, [ cur ] ).length;
            }
            if ( matches[ sel ] ) {
              matches.push( handleObj );
            }
          }
          if ( matches.length ) {
            handlerQueue.push({ elem: cur, handlers: matches });
          }
        }
      }
    }

Add the remaining (directly-bound) handlers

    if ( delegateCount < handlers.length ) {
      handlerQueue.push({ elem: this, handlers: handlers.slice( delegateCount ) });
    }

    return handlerQueue;
  },

  fix: function( event ) {
    if ( event[ jQuery.expando ] ) {
      return event;
    }

Create a writable copy of the event object and normalize some properties

    var i, prop, copy,
      type = event.type,
      originalEvent = event,
      fixHook = this.fixHooks[ type ];

    if ( !fixHook ) {
      this.fixHooks[ type ] = fixHook =
        rmouseEvent.test( type ) ? this.mouseHooks :
        rkeyEvent.test( type ) ? this.keyHooks :
        {};
    }
    copy = fixHook.props ? this.props.concat( fixHook.props ) : this.props;

    event = new jQuery.Event( originalEvent );

    i = copy.length;
    while ( i-- ) {
      prop = copy[ i ];
      event[ prop ] = originalEvent[ prop ];
    }

Support: IE<9 Fix target property (#1925)

    if ( !event.target ) {
      event.target = originalEvent.srcElement || document;
    }

Support: Chrome 23+, Safari? Target should not be a text node (#504, #13143)

    if ( event.target.nodeType === 3 ) {
      event.target = event.target.parentNode;
    }

Support: IE<9 For mouse/key events, metaKey==false if it's undefined (#3368, #11328)

    event.metaKey = !!event.metaKey;

    return fixHook.filter ? fixHook.filter( event, originalEvent ) : event;
  },

Includes some event props shared by KeyEvent and MouseEvent

  props: "altKey bubbles cancelable ctrlKey currentTarget eventPhase metaKey relatedTarget shiftKey target timeStamp view which".split(" "),

  fixHooks: {},

  keyHooks: {
    props: "char charCode key keyCode".split(" "),
    filter: function( event, original ) {

Add which for key events

      if ( event.which == null ) {
        event.which = original.charCode != null ? original.charCode : original.keyCode;
      }

      return event;
    }
  },

  mouseHooks: {
    props: "button buttons clientX clientY fromElement offsetX offsetY pageX pageY screenX screenY toElement".split(" "),
    filter: function( event, original ) {
      var body, eventDoc, doc,
        button = original.button,
        fromElement = original.fromElement;

Calculate pageX/Y if missing and clientX/Y available

      if ( event.pageX == null && original.clientX != null ) {
        eventDoc = event.target.ownerDocument || document;
        doc = eventDoc.documentElement;
        body = eventDoc.body;

        event.pageX = original.clientX + ( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) - ( doc && doc.clientLeft || body && body.clientLeft || 0 );
        event.pageY = original.clientY + ( doc && doc.scrollTop  || body && body.scrollTop  || 0 ) - ( doc && doc.clientTop  || body && body.clientTop  || 0 );
      }

Add relatedTarget, if necessary

      if ( !event.relatedTarget && fromElement ) {
        event.relatedTarget = fromElement === event.target ? original.toElement : fromElement;
      }

Add which for click: 1 === left; 2 === middle; 3 === right Note: button is not normalized, so don't use it

      if ( !event.which && button !== undefined ) {
        event.which = ( button & 1 ? 1 : ( button & 2 ? 3 : ( button & 4 ? 2 : 0 ) ) );
      }

      return event;
    }
  },

  special: {
    load: {

Prevent triggered image.load events from bubbling to window.load

      noBubble: true
    },
    click: {

For checkbox, fire native event so checked state will be right

      trigger: function() {
        if ( jQuery.nodeName( this, "input" ) && this.type === "checkbox" && this.click ) {
          this.click();
          return false;
        }
      }
    },
    focus: {

Fire native event if possible so blur/focus sequence is correct

      trigger: function() {
        if ( this !== document.activeElement && this.focus ) {
          try {
            this.focus();
            return false;
          } catch ( e ) {

Support: IE<9 If we error on focus to hidden element (#1486, #12518), let .trigger() run the handlers

          }
        }
      },
      delegateType: "focusin"
    },
    blur: {
      trigger: function() {
        if ( this === document.activeElement && this.blur ) {
          this.blur();
          return false;
        }
      },
      delegateType: "focusout"
    },

    beforeunload: {
      postDispatch: function( event ) {

Even when returnValue equals to undefined Firefox will still show alert

        if ( event.result !== undefined ) {
          event.originalEvent.returnValue = event.result;
        }
      }
    }
  },

  simulate: function( type, elem, event, bubble ) {

Piggyback on a donor event to simulate a different one. Fake originalEvent to avoid donor's stopPropagation, but if the simulated event prevents default then we do the same on the donor.

    var e = jQuery.extend(
      new jQuery.Event(),
      event,
      { type: type,
        isSimulated: true,
        originalEvent: {}
      }
    );
    if ( bubble ) {
      jQuery.event.trigger( e, null, elem );
    } else {
      jQuery.event.dispatch.call( elem, e );
    }
    if ( e.isDefaultPrevented() ) {
      event.preventDefault();
    }
  }
};

jQuery.removeEvent = document.removeEventListener ?
  function( elem, type, handle ) {
    if ( elem.removeEventListener ) {
      elem.removeEventListener( type, handle, false );
    }
  } :
  function( elem, type, handle ) {
    var name = "on" + type;

    if ( elem.detachEvent ) {

#8545, #7054, preventing memory leaks for custom events in IE6-8 detachEvent needed property on element, by name of that event, to properly expose it to GC

      if ( typeof elem[ name ] === core_strundefined ) {
        elem[ name ] = null;
      }

      elem.detachEvent( name, handle );
    }
  };

jQuery.Event = function( src, props ) {

Allow instantiation without the 'new' keyword

  if ( !(this instanceof jQuery.Event) ) {
    return new jQuery.Event( src, props );
  }

Event object

  if ( src && src.type ) {
    this.originalEvent = src;
    this.type = src.type;

Events bubbling up the document may have been marked as prevented by a handler lower down the tree; reflect the correct value.

    this.isDefaultPrevented = ( src.defaultPrevented || src.returnValue === false ||
      src.getPreventDefault && src.getPreventDefault() ) ? returnTrue : returnFalse;

Event type

  } else {
    this.type = src;
  }

Put explicitly provided properties onto the event object

  if ( props ) {
    jQuery.extend( this, props );
  }

Create a timestamp if incoming event doesn't have one

  this.timeStamp = src && src.timeStamp || jQuery.now();

Mark it as fixed

  this[ jQuery.expando ] = true;
};

jQuery.Event is based on DOM3 Events as specified by the ECMAScript Language Binding http://www.w3.org/TR/2003/WD-DOM-Level-3-Events-20030331/ecma-script-binding.html

jQuery.Event.prototype = {
  isDefaultPrevented: returnFalse,
  isPropagationStopped: returnFalse,
  isImmediatePropagationStopped: returnFalse,

  preventDefault: function() {
    var e = this.originalEvent;

    this.isDefaultPrevented = returnTrue;
    if ( !e ) {
      return;
    }

If preventDefault exists, run it on the original event

    if ( e.preventDefault ) {
      e.preventDefault();

Support: IE Otherwise set the returnValue property of the original event to false

    } else {
      e.returnValue = false;
    }
  },
  stopPropagation: function() {
    var e = this.originalEvent;

    this.isPropagationStopped = returnTrue;
    if ( !e ) {
      return;
    }

If stopPropagation exists, run it on the original event

    if ( e.stopPropagation ) {
      e.stopPropagation();
    }

Support: IE Set the cancelBubble property of the original event to true

    e.cancelBubble = true;
  },
  stopImmediatePropagation: function() {
    this.isImmediatePropagationStopped = returnTrue;
    this.stopPropagation();
  }
};

Create mouseenter/leave events using mouseover/out and event-time checks

jQuery.each({
  mouseenter: "mouseover",
  mouseleave: "mouseout"
}, function( orig, fix ) {
  jQuery.event.special[ orig ] = {
    delegateType: fix,
    bindType: fix,

    handle: function( event ) {
      var ret,
        target = this,
        related = event.relatedTarget,
        handleObj = event.handleObj;

For mousenter/leave call the handler if related is outside the target. NB: No relatedTarget if the mouse left/entered the browser window

      if ( !related || (related !== target && !jQuery.contains( target, related )) ) {
        event.type = handleObj.origType;
        ret = handleObj.handler.apply( this, arguments );
        event.type = fix;
      }
      return ret;
    }
  };
});

IE submit delegation

if ( !jQuery.support.submitBubbles ) {

  jQuery.event.special.submit = {
    setup: function() {

Only need this for delegated form submit events

      if ( jQuery.nodeName( this, "form" ) ) {
        return false;
      }

Lazy-add a submit handler when a descendant form may potentially be submitted

      jQuery.event.add( this, "click._submit keypress._submit", function( e ) {

Node name check avoids a VML-related crash in IE (#9807)

        var elem = e.target,
          form = jQuery.nodeName( elem, "input" ) || jQuery.nodeName( elem, "button" ) ? elem.form : undefined;
        if ( form && !jQuery._data( form, "submitBubbles" ) ) {
          jQuery.event.add( form, "submit._submit", function( event ) {
            event._submit_bubble = true;
          });
          jQuery._data( form, "submitBubbles", true );
        }
      });

return undefined since we don't need an event listener

    },

    postDispatch: function( event ) {

If form was submitted by the user, bubble the event up the tree

      if ( event._submit_bubble ) {
        delete event._submit_bubble;
        if ( this.parentNode && !event.isTrigger ) {
          jQuery.event.simulate( "submit", this.parentNode, event, true );
        }
      }
    },

    teardown: function() {

Only need this for delegated form submit events

      if ( jQuery.nodeName( this, "form" ) ) {
        return false;
      }

Remove delegated handlers; cleanData eventually reaps submit handlers attached above

      jQuery.event.remove( this, "._submit" );
    }
  };
}

IE change delegation and checkbox/radio fix

if ( !jQuery.support.changeBubbles ) {

  jQuery.event.special.change = {

    setup: function() {

      if ( rformElems.test( this.nodeName ) ) {

IE doesn't fire change on a check/radio until blur; trigger it on click after a propertychange. Eat the blur-change in special.change.handle. This still fires onchange a second time for check/radio after blur.

        if ( this.type === "checkbox" || this.type === "radio" ) {
          jQuery.event.add( this, "propertychange._change", function( event ) {
            if ( event.originalEvent.propertyName === "checked" ) {
              this._just_changed = true;
            }
          });
          jQuery.event.add( this, "click._change", function( event ) {
            if ( this._just_changed && !event.isTrigger ) {
              this._just_changed = false;
            }

Allow triggered, simulated change events (#11500)

            jQuery.event.simulate( "change", this, event, true );
          });
        }
        return false;
      }

Delegated event; lazy-add a change handler on descendant inputs

      jQuery.event.add( this, "beforeactivate._change", function( e ) {
        var elem = e.target;

        if ( rformElems.test( elem.nodeName ) && !jQuery._data( elem, "changeBubbles" ) ) {
          jQuery.event.add( elem, "change._change", function( event ) {
            if ( this.parentNode && !event.isSimulated && !event.isTrigger ) {
              jQuery.event.simulate( "change", this.parentNode, event, true );
            }
          });
          jQuery._data( elem, "changeBubbles", true );
        }
      });
    },

    handle: function( event ) {
      var elem = event.target;

Swallow native change events from checkbox/radio, we already triggered them above

      if ( this !== elem || event.isSimulated || event.isTrigger || (elem.type !== "radio" && elem.type !== "checkbox") ) {
        return event.handleObj.handler.apply( this, arguments );
      }
    },

    teardown: function() {
      jQuery.event.remove( this, "._change" );

      return !rformElems.test( this.nodeName );
    }
  };
}

Create "bubbling" focus and blur events

if ( !jQuery.support.focusinBubbles ) {
  jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ) {

Attach a single capturing handler while someone wants focusin/focusout

    var attaches = 0,
      handler = function( event ) {
        jQuery.event.simulate( fix, event.target, jQuery.event.fix( event ), true );
      };

    jQuery.event.special[ fix ] = {
      setup: function() {
        if ( attaches++ === 0 ) {
          document.addEventListener( orig, handler, true );
        }
      },
      teardown: function() {
        if ( --attaches === 0 ) {
          document.removeEventListener( orig, handler, true );
        }
      }
    };
  });
}

jQuery.fn.extend({

  on: function( types, selector, data, fn, //INTERNAL one ) {
    var type, origFn;

Types can be a map of types/handlers

    if ( typeof types === "object" ) {

( types-Object, selector, data )

      if ( typeof selector !== "string" ) {

( types-Object, data )

        data = data || selector;
        selector = undefined;
      }
      for ( type in types ) {
        this.on( type, selector, data, types[ type ], one );
      }
      return this;
    }

    if ( data == null && fn == null ) {

( types, fn )

      fn = selector;
      data = selector = undefined;
    } else if ( fn == null ) {
      if ( typeof selector === "string" ) {

( types, selector, fn )

        fn = data;
        data = undefined;
      } else {

( types, data, fn )

        fn = data;
        data = selector;
        selector = undefined;
      }
    }
    if ( fn === false ) {
      fn = returnFalse;
    } else if ( !fn ) {
      return this;
    }

    if ( one === 1 ) {
      origFn = fn;
      fn = function( event ) {

Can use an empty set, since event contains the info

        jQuery().off( event );
        return origFn.apply( this, arguments );
      };

Use same guid so caller can remove using origFn

      fn.guid = origFn.guid || ( origFn.guid = jQuery.guid++ );
    }
    return this.each( function() {
      jQuery.event.add( this, types, fn, data, selector );
    });
  },
  one: function( types, selector, data, fn ) {
    return this.on( types, selector, data, fn, 1 );
  },
  off: function( types, selector, fn ) {
    var handleObj, type;
    if ( types && types.preventDefault && types.handleObj ) {

( event ) dispatched jQuery.Event

      handleObj = types.handleObj;
      jQuery( types.delegateTarget ).off(
        handleObj.namespace ? handleObj.origType + "." + handleObj.namespace : handleObj.origType,
        handleObj.selector,
        handleObj.handler
      );
      return this;
    }
    if ( typeof types === "object" ) {

( types-object [, selector] )

      for ( type in types ) {
        this.off( type, selector, types[ type ] );
      }
      return this;
    }
    if ( selector === false || typeof selector === "function" ) {

( types [, fn] )

      fn = selector;
      selector = undefined;
    }
    if ( fn === false ) {
      fn = returnFalse;
    }
    return this.each(function() {
      jQuery.event.remove( this, types, fn, selector );
    });
  },

  bind: function( types, data, fn ) {
    return this.on( types, null, data, fn );
  },
  unbind: function( types, fn ) {
    return this.off( types, null, fn );
  },

  delegate: function( selector, types, data, fn ) {
    return this.on( types, selector, data, fn );
  },
  undelegate: function( selector, types, fn ) {

( namespace ) or ( selector, types [, fn] )

    return arguments.length === 1 ? this.off( selector, "**" ) : this.off( types, selector || "**", fn );
  },

  trigger: function( type, data ) {
    return this.each(function() {
      jQuery.event.trigger( type, data, this );
    });
  },
  triggerHandler: function( type, data ) {
    var elem = this[0];
    if ( elem ) {
      return jQuery.event.trigger( type, data, elem, true );
    }
  }
});

Sizzle CSS Selector Engine Copyright 2012 jQuery Foundation and other contributors Released under the MIT license http://sizzlejs.com/

(function( window, undefined ) {

var i,
  cachedruns,
  Expr,
  getText,
  isXML,
  compile,
  hasDuplicate,
  outermostContext,

Local document vars

  setDocument,
  document,
  docElem,
  documentIsXML,
  rbuggyQSA,
  rbuggyMatches,
  matches,
  contains,
  sortOrder,

Instance-specific data

  expando = "sizzle" + -(new Date()),
  preferredDoc = window.document,
  support = {},
  dirruns = 0,
  done = 0,
  classCache = createCache(),
  tokenCache = createCache(),
  compilerCache = createCache(),

General-purpose constants

  strundefined = typeof undefined,
  MAX_NEGATIVE = 1 << 31,

Array methods

  arr = [],
  pop = arr.pop,
  push = arr.push,
  slice = arr.slice,

Use a stripped-down indexOf if we can't use a native one

  indexOf = arr.indexOf || function( elem ) {
    var i = 0,
      len = this.length;
    for ( ; i < len; i++ ) {
      if ( this[i] === elem ) {
        return i;
      }
    }
    return -1;
  },

Regular expressions

Whitespace characters http://www.w3.org/TR/css3-selectors/#whitespace

  whitespace = "[\\x20\\t\\r\\n\\f]",

http://www.w3.org/TR/css3-syntax/#characters

  characterEncoding = "(?:\\\\.|[\\w-]|[^\\x00-\\xa0])+",

Loosely modeled on CSS identifier characters An unquoted value should be a CSS identifier http://www.w3.org/TR/css3-selectors/#attribute-selectors Proper syntax: http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier

  identifier = characterEncoding.replace( "w", "w#" ),

Acceptable operators http://www.w3.org/TR/selectors/#attribute-selectors

  operators = "([*^$|!~]?=)",
  attributes = "\\[" + whitespace + "*(" + characterEncoding + ")" + whitespace +
    "*(?:" + operators + whitespace + "*(?:(['\"])((?:\\\\.|[^\\\\])*?)\\3|(" + identifier + ")|)|)" + whitespace + "*\\]",

Prefer arguments quoted, then not containing pseudos/brackets, then attribute selectors/non-parenthetical expressions, then anything else These preferences are here to reduce the number of selectors needing tokenize in the PSEUDO preFilter

  pseudos = ":(" + characterEncoding + ")(?:\\(((['\"])((?:\\\\.|[^\\\\])*?)\\3|((?:\\\\.|[^\\\\()[\\]]|" + attributes.replace( 3, 8 ) + ")*)|.*)\\)|)",

Leading and non-escaped trailing whitespace, capturing some non-whitespace characters preceding the latter

  rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ),

  rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ),
  rcombinators = new RegExp( "^" + whitespace + "*([\\x20\\t\\r\\n\\f>+~])" + whitespace + "*" ),
  rpseudo = new RegExp( pseudos ),
  ridentifier = new RegExp( "^" + identifier + "$" ),

  matchExpr = {
    "ID": new RegExp( "^#(" + characterEncoding + ")" ),
    "CLASS": new RegExp( "^\\.(" + characterEncoding + ")" ),
    "NAME": new RegExp( "^\\[name=['\"]?(" + characterEncoding + ")['\"]?\\]" ),
    "TAG": new RegExp( "^(" + characterEncoding.replace( "w", "w*" ) + ")" ),
    "ATTR": new RegExp( "^" + attributes ),
    "PSEUDO": new RegExp( "^" + pseudos ),
    "CHILD": new RegExp( "^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\(" + whitespace +
      "*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" + whitespace +
      "*(\\d+)|))" + whitespace + "*\\)|)", "i" ),

For use in libraries implementing .is() We use this for POS matching in select

    "needsContext": new RegExp( "^" + whitespace + "*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\(" +
      whitespace + "*((?:-\\d)?\\d*)" + whitespace + "*\\)|)(?=[^-]|$)", "i" )
  },

  rsibling = /[\x20\t\r\n\f]*[+~]/,

  rnative = /^[^{]+\{\s*\[native code/,

Easily-parseable/retrievable ID or TAG or CLASS selectors

  rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/,

  rinputs = /^(?:input|select|textarea|button)$/i,
  rheader = /^h\d$/i,

  rescape = /'|\\/g,
  rattributeQuotes = /\=[\x20\t\r\n\f]*([^'"\]]*)[\x20\t\r\n\f]*\]/g,

CSS escapes http://www.w3.org/TR/CSS21/syndata.html#escaped-characters

  runescape = /\\([\da-fA-F]{1,6}[\x20\t\r\n\f]?|.)/g,
  funescape = function( _, escaped ) {
    var high = "0x" + escaped - 0x10000;

NaN means non-codepoint

    return high !== high ?
      escaped :

BMP codepoint

      high < 0 ?
        String.fromCharCode( high + 0x10000 ) :

Supplemental Plane codepoint (surrogate pair)

        String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
  };

Use a stripped-down slice if we can't use a native one

try {
  slice.call( preferredDoc.documentElement.childNodes, 0 )[0].nodeType;
} catch ( e ) {
  slice = function( i ) {
    var elem,
      results = [];
    while ( (elem = this[i++]) ) {
      results.push( elem );
    }
    return results;
  };
}

For feature detection

@param {Function} fn The function to test for native support

function isNative( fn ) {
  return rnative.test( fn + "" );
}

Create key-value caches of limited size

@returns {Function(string, Object)} Returns the Object data after storing it on itself with property name the (space-suffixed) string and (if the cache is larger than Expr.cacheLength) deleting the oldest entry

function createCache() {
  var cache,
    keys = [];

  return (cache = function( key, value ) {

Use (key + " ") to avoid collision with native prototype properties (see Issue #157)

    if ( keys.push( key += " " ) > Expr.cacheLength ) {

Only keep the most recent entries

      delete cache[ keys.shift() ];
    }
    return (cache[ key ] = value);
  });
}

Mark a function for special use by Sizzle

@param {Function} fn The function to mark

function markFunction( fn ) {
  fn[ expando ] = true;
  return fn;
}

Support testing using an element

@param {Function} fn Passed the created div and expects a boolean result

function assert( fn ) {
  var div = document.createElement("div");

  try {
    return fn( div );
  } catch (e) {
    return false;
  } finally {

release memory in IE

    div = null;
  }
}

function Sizzle( selector, context, results, seed ) {
  var match, elem, m, nodeType,

QSA vars

    i, groups, old, nid, newContext, newSelector;

  if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) {
    setDocument( context );
  }

  context = context || document;
  results = results || [];

  if ( !selector || typeof selector !== "string" ) {
    return results;
  }

  if ( (nodeType = context.nodeType) !== 1 && nodeType !== 9 ) {
    return [];
  }

  if ( !documentIsXML && !seed ) {

Shortcuts

    if ( (match = rquickExpr.exec( selector )) ) {

Speed-up: Sizzle("#ID")

      if ( (m = match[1]) ) {
        if ( nodeType === 9 ) {
          elem = context.getElementById( m );

Check parentNode to catch when Blackberry 4.6 returns nodes that are no longer in the document #6963

          if ( elem && elem.parentNode ) {

Handle the case where IE, Opera, and Webkit return items by name instead of ID

            if ( elem.id === m ) {
              results.push( elem );
              return results;
            }
          } else {
            return results;
          }
        } else {

Context is not a document

          if ( context.ownerDocument && (elem = context.ownerDocument.getElementById( m )) &&
            contains( context, elem ) && elem.id === m ) {
            results.push( elem );
            return results;
          }
        }

Speed-up: Sizzle("TAG")

      } else if ( match[2] ) {
        push.apply( results, slice.call(context.getElementsByTagName( selector ), 0) );
        return results;

Speed-up: Sizzle(".CLASS")

      } else if ( (m = match[3]) && support.getByClassName && context.getElementsByClassName ) {
        push.apply( results, slice.call(context.getElementsByClassName( m ), 0) );
        return results;
      }
    }

QSA path

    if ( support.qsa && !rbuggyQSA.test(selector) ) {
      old = true;
      nid = expando;
      newContext = context;
      newSelector = nodeType === 9 && selector;

qSA works strangely on Element-rooted queries We can work around this by specifying an extra ID on the root and working up from there (Thanks to Andrew Dupont for the technique) IE 8 doesn't work on object elements

      if ( nodeType === 1 && context.nodeName.toLowerCase() !== "object" ) {
        groups = tokenize( selector );

        if ( (old = context.getAttribute("id")) ) {
          nid = old.replace( rescape, "\\$&" );
        } else {
          context.setAttribute( "id", nid );
        }
        nid = "[id='" + nid + "'] ";

        i = groups.length;
        while ( i-- ) {
          groups[i] = nid + toSelector( groups[i] );
        }
        newContext = rsibling.test( selector ) && context.parentNode || context;
        newSelector = groups.join(",");
      }

      if ( newSelector ) {
        try {
          push.apply( results, slice.call( newContext.querySelectorAll(
            newSelector
          ), 0 ) );
          return results;
        } catch(qsaError) {
        } finally {
          if ( !old ) {
            context.removeAttribute("id");
          }
        }
      }
    }
  }

All others

  return select( selector.replace( rtrim, "$1" ), context, results, seed );
}

Detect xml

@param {Element|Object} elem An element or a document

isXML = Sizzle.isXML = function( elem ) {

documentElement is verified for cases where it doesn't yet exist (such as loading iframes in IE - #4833)

  var documentElement = elem && (elem.ownerDocument || elem).documentElement;
  return documentElement ? documentElement.nodeName !== "HTML" : false;
};

Sets document-related variables once based on the current document

@param {Element|Object} [doc] An element or document object to use to set the document

@returns {Object} Returns the current document

setDocument = Sizzle.setDocument = function( node ) {
  var doc = node ? node.ownerDocument || node : preferredDoc;

If no document and documentElement is available, return

  if ( doc === document || doc.nodeType !== 9 || !doc.documentElement ) {
    return document;
  }

Set our document

  document = doc;
  docElem = doc.documentElement;

Support tests

  documentIsXML = isXML( doc );

Check if getElementsByTagName("*") returns only elements

  support.tagNameNoComments = assert(function( div ) {
    div.appendChild( doc.createComment("") );
    return !div.getElementsByTagName("*").length;
  });

Check if attributes should be retrieved by attribute nodes

  support.attributes = assert(function( div ) {
    div.innerHTML = "<select></select>";
    var type = typeof div.lastChild.getAttribute("multiple");

IE8 returns a string for some attributes even when not present

    return type !== "boolean" && type !== "string";
  });

Check if getElementsByClassName can be trusted

  support.getByClassName = assert(function( div ) {

Opera can't find a second classname (in 9.6)

    div.innerHTML = "<div class='hidden e'></div><div class='hidden'></div>";
    if ( !div.getElementsByClassName || !div.getElementsByClassName("e").length ) {
      return false;
    }

Safari 3.2 caches class attributes and doesn't catch changes

    div.lastChild.className = "e";
    return div.getElementsByClassName("e").length === 2;
  });

Check if getElementById returns elements by name Check if getElementsByName privileges form controls or returns elements by ID

  support.getByName = assert(function( div ) {

Inject content

    div.id = expando + 0;
    div.innerHTML = "<a name='" + expando + "'></a><div name='" + expando + "'></div>";
    docElem.insertBefore( div, docElem.firstChild );

Test

    var pass = doc.getElementsByName &&

buggy browsers will return fewer than the correct 2

      doc.getElementsByName( expando ).length === 2 +

buggy browsers will return more than the correct 0

      doc.getElementsByName( expando + 0 ).length;
    support.getIdNotName = !doc.getElementById( expando );

Cleanup

    docElem.removeChild( div );

    return pass;
  });

IE6/7 return modified attributes

  Expr.attrHandle = assert(function( div ) {
    div.innerHTML = "<a href='#'></a>";
    return div.firstChild && typeof div.firstChild.getAttribute !== strundefined &&
      div.firstChild.getAttribute("href") === "#";
  }) ?
    {} :
    {
      "href": function( elem ) {
        return elem.getAttribute( "href", 2 );
      },
      "type": function( elem ) {
        return elem.getAttribute("type");
      }
    };

ID find and filter

  if ( support.getIdNotName ) {
    Expr.find["ID"] = function( id, context ) {
      if ( typeof context.getElementById !== strundefined && !documentIsXML ) {
        var m = context.getElementById( id );

Check parentNode to catch when Blackberry 4.6 returns nodes that are no longer in the document #6963

        return m && m.parentNode ? [m] : [];
      }
    };
    Expr.filter["ID"] = function( id ) {
      var attrId = id.replace( runescape, funescape );
      return function( elem ) {
        return elem.getAttribute("id") === attrId;
      };
    };
  } else {
    Expr.find["ID"] = function( id, context ) {
      if ( typeof context.getElementById !== strundefined && !documentIsXML ) {
        var m = context.getElementById( id );

        return m ?
          m.id === id || typeof m.getAttributeNode !== strundefined && m.getAttributeNode("id").value === id ?
            [m] :
            undefined :
          [];
      }
    };
    Expr.filter["ID"] =  function( id ) {
      var attrId = id.replace( runescape, funescape );
      return function( elem ) {
        var node = typeof elem.getAttributeNode !== strundefined && elem.getAttributeNode("id");
        return node && node.value === attrId;
      };
    };
  }

Tag

  Expr.find["TAG"] = support.tagNameNoComments ?
    function( tag, context ) {
      if ( typeof context.getElementsByTagName !== strundefined ) {
        return context.getElementsByTagName( tag );
      }
    } :
    function( tag, context ) {
      var elem,
        tmp = [],
        i = 0,
        results = context.getElementsByTagName( tag );

Filter out possible comments

      if ( tag === "*" ) {
        while ( (elem = results[i++]) ) {
          if ( elem.nodeType === 1 ) {
            tmp.push( elem );
          }
        }

        return tmp;
      }
      return results;
    };

Name

  Expr.find["NAME"] = support.getByName && function( tag, context ) {
    if ( typeof context.getElementsByName !== strundefined ) {
      return context.getElementsByName( name );
    }
  };

Class

  Expr.find["CLASS"] = support.getByClassName && function( className, context ) {
    if ( typeof context.getElementsByClassName !== strundefined && !documentIsXML ) {
      return context.getElementsByClassName( className );
    }
  };

QSA and matchesSelector support

matchesSelector(:active) reports false when true (IE9/Opera 11.5)

  rbuggyMatches = [];

qSa(:focus) reports false when true (Chrome 21), no need to also add to buggyMatches since matches checks buggyQSA A support test would require too much code (would include document ready)

  rbuggyQSA = [ ":focus" ];

  if ( (support.qsa = isNative(doc.querySelectorAll)) ) {

Build QSA regex Regex strategy adopted from Diego Perini

    assert(function( div ) {

Select is set to empty string on purpose This is to test IE's treatment of not explictly setting a boolean content attribute, since its presence should be enough http://bugs.jquery.com/ticket/12359

      div.innerHTML = "<select><option selected=''></option></select>";

IE8 - Some boolean attributes are not treated correctly

      if ( !div.querySelectorAll("[selected]").length ) {
        rbuggyQSA.push( "\\[" + whitespace + "*(?:checked|disabled|ismap|multiple|readonly|selected|value)" );
      }

Webkit/Opera - :checked should return selected option elements http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked IE8 throws error here and will not see later tests

      if ( !div.querySelectorAll(":checked").length ) {
        rbuggyQSA.push(":checked");
      }
    });

    assert(function( div ) {

Opera 10-12/IE8 - ^= $= *= and empty values Should not select anything

      div.innerHTML = "<input type='hidden' i=''/>";
      if ( div.querySelectorAll("[i^='']").length ) {
        rbuggyQSA.push( "[*^$]=" + whitespace + "*(?:\"\"|'')" );
      }

FF 3.5 - :enabled/:disabled and hidden elements (hidden elements are still enabled) IE8 throws error here and will not see later tests

      if ( !div.querySelectorAll(":enabled").length ) {
        rbuggyQSA.push( ":enabled", ":disabled" );
      }

Opera 10-11 does not throw on post-comma invalid pseudos

      div.querySelectorAll("*,:x");
      rbuggyQSA.push(",.*:");
    });
  }

  if ( (support.matchesSelector = isNative( (matches = docElem.matchesSelector ||
    docElem.mozMatchesSelector ||
    docElem.webkitMatchesSelector ||
    docElem.oMatchesSelector ||
    docElem.msMatchesSelector) )) ) {

    assert(function( div ) {

Check to see if it's possible to do matchesSelector on a disconnected node (IE 9)

      support.disconnectedMatch = matches.call( div, "div" );

This should fail with an exception Gecko does not error, returns false instead

      matches.call( div, "[s!='']:x" );
      rbuggyMatches.push( "!=", pseudos );
    });
  }

  rbuggyQSA = new RegExp( rbuggyQSA.join("|") );
  rbuggyMatches = new RegExp( rbuggyMatches.join("|") );

Element contains another Purposefully does not implement inclusive descendent As in, an element does not contain itself

  contains = isNative(docElem.contains) || docElem.compareDocumentPosition ?
    function( a, b ) {
      var adown = a.nodeType === 9 ? a.documentElement : a,
        bup = b && b.parentNode;
      return a === bup || !!( bup && bup.nodeType === 1 && (
        adown.contains ?
          adown.contains( bup ) :
          a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
      ));
    } :
    function( a, b ) {
      if ( b ) {
        while ( (b = b.parentNode) ) {
          if ( b === a ) {
            return true;
          }
        }
      }
      return false;
    };

Document order sorting

  sortOrder = docElem.compareDocumentPosition ?
  function( a, b ) {
    var compare;

    if ( a === b ) {
      hasDuplicate = true;
      return 0;
    }

    if ( (compare = b.compareDocumentPosition && a.compareDocumentPosition && a.compareDocumentPosition( b )) ) {
      if ( compare & 1 || a.parentNode && a.parentNode.nodeType === 11 ) {
        if ( a === doc || contains( preferredDoc, a ) ) {
          return -1;
        }
        if ( b === doc || contains( preferredDoc, b ) ) {
          return 1;
        }
        return 0;
      }
      return compare & 4 ? -1 : 1;
    }

    return a.compareDocumentPosition ? -1 : 1;
  } :
  function( a, b ) {
    var cur,
      i = 0,
      aup = a.parentNode,
      bup = b.parentNode,
      ap = [ a ],
      bp = [ b ];

Exit early if the nodes are identical

    if ( a === b ) {
      hasDuplicate = true;
      return 0;

Parentless nodes are either documents or disconnected

    } else if ( !aup || !bup ) {
      return a === doc ? -1 :
        b === doc ? 1 :
        aup ? -1 :
        bup ? 1 :
        0;

If the nodes are siblings, we can do a quick check

    } else if ( aup === bup ) {
      return siblingCheck( a, b );
    }

Otherwise we need full lists of their ancestors for comparison

    cur = a;
    while ( (cur = cur.parentNode) ) {
      ap.unshift( cur );
    }
    cur = b;
    while ( (cur = cur.parentNode) ) {
      bp.unshift( cur );
    }

Walk down the tree looking for a discrepancy

    while ( ap[i] === bp[i] ) {
      i++;
    }

    return i ?

Do a sibling check if the nodes have a common ancestor

      siblingCheck( ap[i], bp[i] ) :

Otherwise nodes in our document sort first

      ap[i] === preferredDoc ? -1 :
      bp[i] === preferredDoc ? 1 :
      0;
  };

Always assume the presence of duplicates if sort doesn't pass them to our comparison function (as in Google Chrome).

  hasDuplicate = false;
  [0, 0].sort( sortOrder );
  support.detectDuplicates = hasDuplicate;

  return document;
};

Sizzle.matches = function( expr, elements ) {
  return Sizzle( expr, null, null, elements );
};

Sizzle.matchesSelector = function( elem, expr ) {

Set document vars if needed

  if ( ( elem.ownerDocument || elem ) !== document ) {
    setDocument( elem );
  }

Make sure that attribute selectors are quoted

  expr = expr.replace( rattributeQuotes, "='$1']" );

rbuggyQSA always contains :focus, so no need for an existence check

  if ( support.matchesSelector && !documentIsXML && (!rbuggyMatches || !rbuggyMatches.test(expr)) && !rbuggyQSA.test(expr) ) {
    try {
      var ret = matches.call( elem, expr );

IE 9's matchesSelector returns false on disconnected nodes

      if ( ret || support.disconnectedMatch ||

As well, disconnected nodes are said to be in a document fragment in IE 9

          elem.document && elem.document.nodeType !== 11 ) {
        return ret;
      }
    } catch(e) {}
  }

  return Sizzle( expr, document, null, [elem] ).length > 0;
};

Sizzle.contains = function( context, elem ) {

Set document vars if needed

  if ( ( context.ownerDocument || context ) !== document ) {
    setDocument( context );
  }
  return contains( context, elem );
};

Sizzle.attr = function( elem, name ) {
  var val;

Set document vars if needed

  if ( ( elem.ownerDocument || elem ) !== document ) {
    setDocument( elem );
  }

  if ( !documentIsXML ) {
    name = name.toLowerCase();
  }
  if ( (val = Expr.attrHandle[ name ]) ) {
    return val( elem );
  }
  if ( documentIsXML || support.attributes ) {
    return elem.getAttribute( name );
  }
  return ( (val = elem.getAttributeNode( name )) || elem.getAttribute( name ) ) && elem[ name ] === true ?
    name :
    val && val.specified ? val.value : null;
};

Sizzle.error = function( msg ) {
  throw new Error( "Syntax error, unrecognized expression: " + msg );
};

Document sorting and removing duplicates

Sizzle.uniqueSort = function( results ) {
  var elem,
    duplicates = [],
    i = 1,
    j = 0;

Unless we know we can detect duplicates, assume their presence

  hasDuplicate = !support.detectDuplicates;
  results.sort( sortOrder );

  if ( hasDuplicate ) {
    for ( ; (elem = results[i]); i++ ) {
      if ( elem === results[ i - 1 ] ) {
        j = duplicates.push( i );
      }
    }
    while ( j-- ) {
      results.splice( duplicates[ j ], 1 );
    }
  }

  return results;
};

function siblingCheck( a, b ) {
  var cur = b && a,
    diff = cur && ( ~b.sourceIndex || MAX_NEGATIVE ) - ( ~a.sourceIndex || MAX_NEGATIVE );

Use IE sourceIndex if available on both nodes

  if ( diff ) {
    return diff;
  }

Check if b follows a

  if ( cur ) {
    while ( (cur = cur.nextSibling) ) {
      if ( cur === b ) {
        return -1;
      }
    }
  }

  return a ? 1 : -1;
}

Returns a function to use in pseudos for input types

function createInputPseudo( type ) {
  return function( elem ) {
    var name = elem.nodeName.toLowerCase();
    return name === "input" && elem.type === type;
  };
}

Returns a function to use in pseudos for buttons

function createButtonPseudo( type ) {
  return function( elem ) {
    var name = elem.nodeName.toLowerCase();
    return (name === "input" || name === "button") && elem.type === type;
  };
}

Returns a function to use in pseudos for positionals

function createPositionalPseudo( fn ) {
  return markFunction(function( argument ) {
    argument = +argument;
    return markFunction(function( seed, matches ) {
      var j,
        matchIndexes = fn( [], seed.length, argument ),
        i = matchIndexes.length;

Match elements found at the specified indexes

      while ( i-- ) {
        if ( seed[ (j = matchIndexes[i]) ] ) {
          seed[j] = !(matches[j] = seed[j]);
        }
      }
    });
  });
}

Utility function for retrieving the text value of an array of DOM nodes

@param {Array|Element} elem

getText = Sizzle.getText = function( elem ) {
  var node,
    ret = "",
    i = 0,
    nodeType = elem.nodeType;

  if ( !nodeType ) {

If no nodeType, this is expected to be an array

    for ( ; (node = elem[i]); i++ ) {

Do not traverse comment nodes

      ret += getText( node );
    }
  } else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {

Use textContent for elements innerText usage removed for consistency of new lines (see #11153)

    if ( typeof elem.textContent === "string" ) {
      return elem.textContent;
    } else {

Traverse its children

      for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
        ret += getText( elem );
      }
    }
  } else if ( nodeType === 3 || nodeType === 4 ) {
    return elem.nodeValue;
  }

Do not include comment or processing instruction nodes

  return ret;
};

Expr = Sizzle.selectors = {

Can be adjusted by the user

  cacheLength: 50,

  createPseudo: markFunction,

  match: matchExpr,

  find: {},

  relative: {
    ">": { dir: "parentNode", first: true },
    " ": { dir: "parentNode" },
    "+": { dir: "previousSibling", first: true },
    "~": { dir: "previousSibling" }
  },

  preFilter: {
    "ATTR": function( match ) {
      match[1] = match[1].replace( runescape, funescape );

Move the given value to match[3] whether quoted or unquoted

      match[3] = ( match[4] || match[5] || "" ).replace( runescape, funescape );

      if ( match[2] === "~=" ) {
        match[3] = " " + match[3] + " ";
      }

      return match.slice( 0, 4 );
    },

    "CHILD": function( match ) {

matches from matchExpr["CHILD"] 1 type (only|nth|...) 2 what (child|of-type) 3 argument (even|odd|\d|\dn([+-]\d+)?|...) 4 xn-component of xn+y argument ([+-]?\d*n|) 5 sign of xn-component 6 x of xn-component 7 sign of y-component 8 y of y-component

      match[1] = match[1].toLowerCase();

      if ( match[1].slice( 0, 3 ) === "nth" ) {

nth-* requires argument

        if ( !match[3] ) {
          Sizzle.error( match[0] );
        }

numeric x and y parameters for Expr.filter.CHILD remember that false/true cast respectively to 0/1

        match[4] = +( match[4] ? match[5] + (match[6] || 1) : 2 * ( match[3] === "even" || match[3] === "odd" ) );
        match[5] = +( ( match[7] + match[8] ) || match[3] === "odd" );

other types prohibit arguments

      } else if ( match[3] ) {
        Sizzle.error( match[0] );
      }

      return match;
    },

    "PSEUDO": function( match ) {
      var excess,
        unquoted = !match[5] && match[2];

      if ( matchExpr["CHILD"].test( match[0] ) ) {
        return null;
      }

Accept quoted arguments as-is

      if ( match[4] ) {
        match[2] = match[4];

Strip excess characters from unquoted arguments

      } else if ( unquoted && rpseudo.test( unquoted ) &&

Get excess from tokenize (recursively)

        (excess = tokenize( unquoted, true )) &&

advance to the next closing parenthesis

        (excess = unquoted.indexOf( ")", unquoted.length - excess ) - unquoted.length) ) {

excess is a negative index

        match[0] = match[0].slice( 0, excess );
        match[2] = unquoted.slice( 0, excess );
      }

Return only captures needed by the pseudo filter method (type and argument)

      return match.slice( 0, 3 );
    }
  },

  filter: {

    "TAG": function( nodeName ) {
      if ( nodeName === "*" ) {
        return function() { return true; };
      }

      nodeName = nodeName.replace( runescape, funescape ).toLowerCase();
      return function( elem ) {
        return elem.nodeName && elem.nodeName.toLowerCase() === nodeName;
      };
    },

    "CLASS": function( className ) {
      var pattern = classCache[ className + " " ];

      return pattern ||
        (pattern = new RegExp( "(^|" + whitespace + ")" + className + "(" + whitespace + "|$)" )) &&
        classCache( className, function( elem ) {
          return pattern.test( elem.className || (typeof elem.getAttribute !== strundefined && elem.getAttribute("class")) || "" );
        });
    },

    "ATTR": function( name, operator, check ) {
      return function( elem ) {
        var result = Sizzle.attr( elem, name );

        if ( result == null ) {
          return operator === "!=";
        }
        if ( !operator ) {
          return true;
        }

        result += "";

        return operator === "=" ? result === check :
          operator === "!=" ? result !== check :
          operator === "^=" ? check && result.indexOf( check ) === 0 :
          operator === "*=" ? check && result.indexOf( check ) > -1 :
          operator === "$=" ? check && result.slice( -check.length ) === check :
          operator === "~=" ? ( " " + result + " " ).indexOf( check ) > -1 :
          operator === "|=" ? result === check || result.slice( 0, check.length + 1 ) === check + "-" :
          false;
      };
    },

    "CHILD": function( type, what, argument, first, last ) {
      var simple = type.slice( 0, 3 ) !== "nth",
        forward = type.slice( -4 ) !== "last",
        ofType = what === "of-type";

      return first === 1 && last === 0 ?

Shortcut for :nth-*(n)

        function( elem ) {
          return !!elem.parentNode;
        } :

        function( elem, context, xml ) {
          var cache, outerCache, node, diff, nodeIndex, start,
            dir = simple !== forward ? "nextSibling" : "previousSibling",
            parent = elem.parentNode,
            name = ofType && elem.nodeName.toLowerCase(),
            useCache = !xml && !ofType;

          if ( parent ) {

:(first|last|only)-(child|of-type)

            if ( simple ) {
              while ( dir ) {
                node = elem;
                while ( (node = node[ dir ]) ) {
                  if ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) {
                    return false;
                  }
                }

Reverse direction for :only-* (if we haven't yet done so)

                start = dir = type === "only" && !start && "nextSibling";
              }
              return true;
            }

            start = [ forward ? parent.firstChild : parent.lastChild ];

non-xml :nth-child(...) stores cache data on parent

            if ( forward && useCache ) {

Seek elem from a previously-cached index

              outerCache = parent[ expando ] || (parent[ expando ] = {});
              cache = outerCache[ type ] || [];
              nodeIndex = cache[0] === dirruns && cache[1];
              diff = cache[0] === dirruns && cache[2];
              node = nodeIndex && parent.childNodes[ nodeIndex ];

              while ( (node = ++nodeIndex && node && node[ dir ] ||

Fallback to seeking elem from the start

                (diff = nodeIndex = 0) || start.pop()) ) {

When found, cache indexes on parent and break

                if ( node.nodeType === 1 && ++diff && node === elem ) {
                  outerCache[ type ] = [ dirruns, nodeIndex, diff ];
                  break;
                }
              }

Use previously-cached element index if available

            } else if ( useCache && (cache = (elem[ expando ] || (elem[ expando ] = {}))[ type ]) && cache[0] === dirruns ) {
              diff = cache[1];

xml :nth-child(...) or :nth-last-child(...) or :nth(-last)?-of-type(...)

            } else {

Use the same loop as above to seek elem from the start

              while ( (node = ++nodeIndex && node && node[ dir ] ||
                (diff = nodeIndex = 0) || start.pop()) ) {

                if ( ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) && ++diff ) {

Cache the index of each encountered element

                  if ( useCache ) {
                    (node[ expando ] || (node[ expando ] = {}))[ type ] = [ dirruns, diff ];
                  }

                  if ( node === elem ) {
                    break;
                  }
                }
              }
            }

Incorporate the offset, then check against cycle size

            diff -= last;
            return diff === first || ( diff % first === 0 && diff / first >= 0 );
          }
        };
    },

    "PSEUDO": function( pseudo, argument ) {

pseudo-class names are case-insensitive http://www.w3.org/TR/selectors/#pseudo-classes Prioritize by case sensitivity in case custom pseudos are added with uppercase letters Remember that setFilters inherits from pseudos

      var args,
        fn = Expr.pseudos[ pseudo ] || Expr.setFilters[ pseudo.toLowerCase() ] ||
          Sizzle.error( "unsupported pseudo: " + pseudo );

The user may use createPseudo to indicate that arguments are needed to create the filter function just as Sizzle does

      if ( fn[ expando ] ) {
        return fn( argument );
      }

But maintain support for old signatures

      if ( fn.length > 1 ) {
        args = [ pseudo, pseudo, "", argument ];
        return Expr.setFilters.hasOwnProperty( pseudo.toLowerCase() ) ?
          markFunction(function( seed, matches ) {
            var idx,
              matched = fn( seed, argument ),
              i = matched.length;
            while ( i-- ) {
              idx = indexOf.call( seed, matched[i] );
              seed[ idx ] = !( matches[ idx ] = matched[i] );
            }
          }) :
          function( elem ) {
            return fn( elem, 0, args );
          };
      }

      return fn;
    }
  },

  pseudos: {

Potentially complex pseudos

    "not": markFunction(function( selector ) {

Trim the selector passed to compile to avoid treating leading and trailing spaces as combinators

      var input = [],
        results = [],
        matcher = compile( selector.replace( rtrim, "$1" ) );

      return matcher[ expando ] ?
        markFunction(function( seed, matches, context, xml ) {
          var elem,
            unmatched = matcher( seed, null, xml, [] ),
            i = seed.length;

Match elements unmatched by matcher

          while ( i-- ) {
            if ( (elem = unmatched[i]) ) {
              seed[i] = !(matches[i] = elem);
            }
          }
        }) :
        function( elem, context, xml ) {
          input[0] = elem;
          matcher( input, null, xml, results );
          return !results.pop();
        };
    }),

    "has": markFunction(function( selector ) {
      return function( elem ) {
        return Sizzle( selector, elem ).length > 0;
      };
    }),

    "contains": markFunction(function( text ) {
      return function( elem ) {
        return ( elem.textContent || elem.innerText || getText( elem ) ).indexOf( text ) > -1;
      };
    }),

"Whether an element is represented by a :lang() selector is based solely on the element's language value being equal to the identifier C, or beginning with the identifier C immediately followed by "-". The matching of C against the element's language value is performed case-insensitively. The identifier C does not have to be a valid language name." http://www.w3.org/TR/selectors/#lang-pseudo

    "lang": markFunction( function( lang ) {

lang value must be a valid identifider

      if ( !ridentifier.test(lang || "") ) {
        Sizzle.error( "unsupported lang: " + lang );
      }
      lang = lang.replace( runescape, funescape ).toLowerCase();
      return function( elem ) {
        var elemLang;
        do {
          if ( (elemLang = documentIsXML ?
            elem.getAttribute("xml:lang") || elem.getAttribute("lang") :
            elem.lang) ) {

            elemLang = elemLang.toLowerCase();
            return elemLang === lang || elemLang.indexOf( lang + "-" ) === 0;
          }
        } while ( (elem = elem.parentNode) && elem.nodeType === 1 );
        return false;
      };
    }),

Miscellaneous

    "target": function( elem ) {
      var hash = window.location && window.location.hash;
      return hash && hash.slice( 1 ) === elem.id;
    },

    "root": function( elem ) {
      return elem === docElem;
    },

    "focus": function( elem ) {
      return elem === document.activeElement && (!document.hasFocus || document.hasFocus()) && !!(elem.type || elem.href || ~elem.tabIndex);
    },

Boolean properties

    "enabled": function( elem ) {
      return elem.disabled === false;
    },

    "disabled": function( elem ) {
      return elem.disabled === true;
    },

    "checked": function( elem ) {

In CSS3, :checked should return both checked and selected elements http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked

      var nodeName = elem.nodeName.toLowerCase();
      return (nodeName === "input" && !!elem.checked) || (nodeName === "option" && !!elem.selected);
    },

    "selected": function( elem ) {

Accessing this property makes selected-by-default options in Safari work properly

      if ( elem.parentNode ) {
        elem.parentNode.selectedIndex;
      }

      return elem.selected === true;
    },

Contents

    "empty": function( elem ) {

http://www.w3.org/TR/selectors/#empty-pseudo :empty is only affected by element nodes and content nodes(including text(3), cdata(4)), not comment, processing instructions, or others Thanks to Diego Perini for the nodeName shortcut Greater than "@" means alpha characters (specifically not starting with "#" or "?")

      for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
        if ( elem.nodeName > "@" || elem.nodeType === 3 || elem.nodeType === 4 ) {
          return false;
        }
      }
      return true;
    },

    "parent": function( elem ) {
      return !Expr.pseudos["empty"]( elem );
    },

Element/input types

    "header": function( elem ) {
      return rheader.test( elem.nodeName );
    },

    "input": function( elem ) {
      return rinputs.test( elem.nodeName );
    },

    "button": function( elem ) {
      var name = elem.nodeName.toLowerCase();
      return name === "input" && elem.type === "button" || name === "button";
    },

    "text": function( elem ) {
      var attr;

IE6 and 7 will map elem.type to 'text' for new HTML5 types (search, etc) use getAttribute instead to test this case

      return elem.nodeName.toLowerCase() === "input" &&
        elem.type === "text" &&
        ( (attr = elem.getAttribute("type")) == null || attr.toLowerCase() === elem.type );
    },

Position-in-collection

    "first": createPositionalPseudo(function() {
      return [ 0 ];
    }),

    "last": createPositionalPseudo(function( matchIndexes, length ) {
      return [ length - 1 ];
    }),

    "eq": createPositionalPseudo(function( matchIndexes, length, argument ) {
      return [ argument < 0 ? argument + length : argument ];
    }),

    "even": createPositionalPseudo(function( matchIndexes, length ) {
      var i = 0;
      for ( ; i < length; i += 2 ) {
        matchIndexes.push( i );
      }
      return matchIndexes;
    }),

    "odd": createPositionalPseudo(function( matchIndexes, length ) {
      var i = 1;
      for ( ; i < length; i += 2 ) {
        matchIndexes.push( i );
      }
      return matchIndexes;
    }),

    "lt": createPositionalPseudo(function( matchIndexes, length, argument ) {
      var i = argument < 0 ? argument + length : argument;
      for ( ; --i >= 0; ) {
        matchIndexes.push( i );
      }
      return matchIndexes;
    }),

    "gt": createPositionalPseudo(function( matchIndexes, length, argument ) {
      var i = argument < 0 ? argument + length : argument;
      for ( ; ++i < length; ) {
        matchIndexes.push( i );
      }
      return matchIndexes;
    })
  }
};

Add button/input type pseudos

for ( i in { radio: true, checkbox: true, file: true, password: true, image: true } ) {
  Expr.pseudos[ i ] = createInputPseudo( i );
}
for ( i in { submit: true, reset: true } ) {
  Expr.pseudos[ i ] = createButtonPseudo( i );
}

function tokenize( selector, parseOnly ) {
  var matched, match, tokens, type,
    soFar, groups, preFilters,
    cached = tokenCache[ selector + " " ];

  if ( cached ) {
    return parseOnly ? 0 : cached.slice( 0 );
  }

  soFar = selector;
  groups = [];
  preFilters = Expr.preFilter;

  while ( soFar ) {

Comma and first run

    if ( !matched || (match = rcomma.exec( soFar )) ) {
      if ( match ) {

Don't consume trailing commas as valid

        soFar = soFar.slice( match[0].length ) || soFar;
      }
      groups.push( tokens = [] );
    }

    matched = false;

Combinators

    if ( (match = rcombinators.exec( soFar )) ) {
      matched = match.shift();
      tokens.push( {
        value: matched,

Cast descendant combinators to space

        type: match[0].replace( rtrim, " " )
      } );
      soFar = soFar.slice( matched.length );
    }

Filters

    for ( type in Expr.filter ) {
      if ( (match = matchExpr[ type ].exec( soFar )) && (!preFilters[ type ] ||
        (match = preFilters[ type ]( match ))) ) {
        matched = match.shift();
        tokens.push( {
          value: matched,
          type: type,
          matches: match
        } );
        soFar = soFar.slice( matched.length );
      }
    }

    if ( !matched ) {
      break;
    }
  }

Return the length of the invalid excess if we're just parsing Otherwise, throw an error or return tokens

  return parseOnly ?
    soFar.length :
    soFar ?
      Sizzle.error( selector ) :

Cache the tokens

      tokenCache( selector, groups ).slice( 0 );
}

function toSelector( tokens ) {
  var i = 0,
    len = tokens.length,
    selector = "";
  for ( ; i < len; i++ ) {
    selector += tokens[i].value;
  }
  return selector;
}

function addCombinator( matcher, combinator, base ) {
  var dir = combinator.dir,
    checkNonElements = base && dir === "parentNode",
    doneName = done++;

  return combinator.first ?

Check against closest ancestor/preceding element

    function( elem, context, xml ) {
      while ( (elem = elem[ dir ]) ) {
        if ( elem.nodeType === 1 || checkNonElements ) {
          return matcher( elem, context, xml );
        }
      }
    } :

Check against all ancestor/preceding elements

    function( elem, context, xml ) {
      var data, cache, outerCache,
        dirkey = dirruns + " " + doneName;

We can't set arbitrary data on XML nodes, so they don't benefit from dir caching

      if ( xml ) {
        while ( (elem = elem[ dir ]) ) {
          if ( elem.nodeType === 1 || checkNonElements ) {
            if ( matcher( elem, context, xml ) ) {
              return true;
            }
          }
        }
      } else {
        while ( (elem = elem[ dir ]) ) {
          if ( elem.nodeType === 1 || checkNonElements ) {
            outerCache = elem[ expando ] || (elem[ expando ] = {});
            if ( (cache = outerCache[ dir ]) && cache[0] === dirkey ) {
              if ( (data = cache[1]) === true || data === cachedruns ) {
                return data === true;
              }
            } else {
              cache = outerCache[ dir ] = [ dirkey ];
              cache[1] = matcher( elem, context, xml ) || cachedruns;
              if ( cache[1] === true ) {
                return true;
              }
            }
          }
        }
      }
    };
}

function elementMatcher( matchers ) {
  return matchers.length > 1 ?
    function( elem, context, xml ) {
      var i = matchers.length;
      while ( i-- ) {
        if ( !matchers[i]( elem, context, xml ) ) {
          return false;
        }
      }
      return true;
    } :
    matchers[0];
}

function condense( unmatched, map, filter, context, xml ) {
  var elem,
    newUnmatched = [],
    i = 0,
    len = unmatched.length,
    mapped = map != null;

  for ( ; i < len; i++ ) {
    if ( (elem = unmatched[i]) ) {
      if ( !filter || filter( elem, context, xml ) ) {
        newUnmatched.push( elem );
        if ( mapped ) {
          map.push( i );
        }
      }
    }
  }

  return newUnmatched;
}

function setMatcher( preFilter, selector, matcher, postFilter, postFinder, postSelector ) {
  if ( postFilter && !postFilter[ expando ] ) {
    postFilter = setMatcher( postFilter );
  }
  if ( postFinder && !postFinder[ expando ] ) {
    postFinder = setMatcher( postFinder, postSelector );
  }
  return markFunction(function( seed, results, context, xml ) {
    var temp, i, elem,
      preMap = [],
      postMap = [],
      preexisting = results.length,

Get initial elements from seed or context

      elems = seed || multipleContexts( selector || "*", context.nodeType ? [ context ] : context, [] ),

Prefilter to get matcher input, preserving a map for seed-results synchronization

      matcherIn = preFilter && ( seed || !selector ) ?
        condense( elems, preMap, preFilter, context, xml ) :
        elems,

      matcherOut = matcher ?

If we have a postFinder, or filtered seed, or non-seed postFilter or preexisting results,

        postFinder || ( seed ? preFilter : preexisting || postFilter ) ?

...intermediate processing is necessary

          [] :

...otherwise use results directly

          results :
        matcherIn;

Find primary matches

    if ( matcher ) {
      matcher( matcherIn, matcherOut, context, xml );
    }

Apply postFilter

    if ( postFilter ) {
      temp = condense( matcherOut, postMap );
      postFilter( temp, [], context, xml );

Un-match failing elements by moving them back to matcherIn

      i = temp.length;
      while ( i-- ) {
        if ( (elem = temp[i]) ) {
          matcherOut[ postMap[i] ] = !(matcherIn[ postMap[i] ] = elem);
        }
      }
    }

    if ( seed ) {
      if ( postFinder || preFilter ) {
        if ( postFinder ) {

Get the final matcherOut by condensing this intermediate into postFinder contexts

          temp = [];
          i = matcherOut.length;
          while ( i-- ) {
            if ( (elem = matcherOut[i]) ) {

Restore matcherIn since elem is not yet a final match

              temp.push( (matcherIn[i] = elem) );
            }
          }
          postFinder( null, (matcherOut = []), temp, xml );
        }

Move matched elements from seed to results to keep them synchronized

        i = matcherOut.length;
        while ( i-- ) {
          if ( (elem = matcherOut[i]) &&
            (temp = postFinder ? indexOf.call( seed, elem ) : preMap[i]) > -1 ) {

            seed[temp] = !(results[temp] = elem);
          }
        }
      }

Add elements to results, through postFinder if defined

    } else {
      matcherOut = condense(
        matcherOut === results ?
          matcherOut.splice( preexisting, matcherOut.length ) :
          matcherOut
      );
      if ( postFinder ) {
        postFinder( null, results, matcherOut, xml );
      } else {
        push.apply( results, matcherOut );
      }
    }
  });
}

function matcherFromTokens( tokens ) {
  var checkContext, matcher, j,
    len = tokens.length,
    leadingRelative = Expr.relative[ tokens[0].type ],
    implicitRelative = leadingRelative || Expr.relative[" "],
    i = leadingRelative ? 1 : 0,

The foundational matcher ensures that elements are reachable from top-level context(s)

    matchContext = addCombinator( function( elem ) {
      return elem === checkContext;
    }, implicitRelative, true ),
    matchAnyContext = addCombinator( function( elem ) {
      return indexOf.call( checkContext, elem ) > -1;
    }, implicitRelative, true ),
    matchers = [ function( elem, context, xml ) {
      return ( !leadingRelative && ( xml || context !== outermostContext ) ) || (
        (checkContext = context).nodeType ?
          matchContext( elem, context, xml ) :
          matchAnyContext( elem, context, xml ) );
    } ];

  for ( ; i < len; i++ ) {
    if ( (matcher = Expr.relative[ tokens[i].type ]) ) {
      matchers = [ addCombinator(elementMatcher( matchers ), matcher) ];
    } else {
      matcher = Expr.filter[ tokens[i].type ].apply( null, tokens[i].matches );

Return special upon seeing a positional matcher

      if ( matcher[ expando ] ) {

Find the next relative operator (if any) for proper handling

        j = ++i;
        for ( ; j < len; j++ ) {
          if ( Expr.relative[ tokens[j].type ] ) {
            break;
          }
        }
        return setMatcher(
          i > 1 && elementMatcher( matchers ),
          i > 1 && toSelector( tokens.slice( 0, i - 1 ) ).replace( rtrim, "$1" ),
          matcher,
          i < j && matcherFromTokens( tokens.slice( i, j ) ),
          j < len && matcherFromTokens( (tokens = tokens.slice( j )) ),
          j < len && toSelector( tokens )
        );
      }
      matchers.push( matcher );
    }
  }

  return elementMatcher( matchers );
}

function matcherFromGroupMatchers( elementMatchers, setMatchers ) {

A counter to specify which element is currently being matched

  var matcherCachedRuns = 0,
    bySet = setMatchers.length > 0,
    byElement = elementMatchers.length > 0,
    superMatcher = function( seed, context, xml, results, expandContext ) {
      var elem, j, matcher,
        setMatched = [],
        matchedCount = 0,
        i = "0",
        unmatched = seed && [],
        outermost = expandContext != null,
        contextBackup = outermostContext,

We must always have either seed elements or context

        elems = seed || byElement && Expr.find["TAG"]( "*", expandContext && context.parentNode || context ),

Use integer dirruns iff this is the outermost matcher

        dirrunsUnique = (dirruns += contextBackup == null ? 1 : Math.random() || 0.1);

      if ( outermost ) {
        outermostContext = context !== document && context;
        cachedruns = matcherCachedRuns;
      }

Add elements passing elementMatchers directly to results Keep i a string if there are no elements so matchedCount will be "00" below

      for ( ; (elem = elems[i]) != null; i++ ) {
        if ( byElement && elem ) {
          j = 0;
          while ( (matcher = elementMatchers[j++]) ) {
            if ( matcher( elem, context, xml ) ) {
              results.push( elem );
              break;
            }
          }
          if ( outermost ) {
            dirruns = dirrunsUnique;
            cachedruns = ++matcherCachedRuns;
          }
        }

Track unmatched elements for set filters

        if ( bySet ) {

They will have gone through all possible matchers

          if ( (elem = !matcher && elem) ) {
            matchedCount--;
          }

Lengthen the array for every element, matched or not

          if ( seed ) {
            unmatched.push( elem );
          }
        }
      }

Apply set filters to unmatched elements

      matchedCount += i;
      if ( bySet && i !== matchedCount ) {
        j = 0;
        while ( (matcher = setMatchers[j++]) ) {
          matcher( unmatched, setMatched, context, xml );
        }

        if ( seed ) {

Reintegrate element matches to eliminate the need for sorting

          if ( matchedCount > 0 ) {
            while ( i-- ) {
              if ( !(unmatched[i] || setMatched[i]) ) {
                setMatched[i] = pop.call( results );
              }
            }
          }

Discard index placeholder values to get only actual matches

          setMatched = condense( setMatched );
        }

Add matches to results

        push.apply( results, setMatched );

Seedless set matches succeeding multiple successful matchers stipulate sorting

        if ( outermost && !seed && setMatched.length > 0 &&
          ( matchedCount + setMatchers.length ) > 1 ) {

          Sizzle.uniqueSort( results );
        }
      }

Override manipulation of globals by nested matchers

      if ( outermost ) {
        dirruns = dirrunsUnique;
        outermostContext = contextBackup;
      }

      return unmatched;
    };

  return bySet ?
    markFunction( superMatcher ) :
    superMatcher;
}

compile = Sizzle.compile = function( selector, group // Internal Use Only ) {
  var i,
    setMatchers = [],
    elementMatchers = [],
    cached = compilerCache[ selector + " " ];

  if ( !cached ) {

Generate a function of recursive functions that can be used to check each element

    if ( !group ) {
      group = tokenize( selector );
    }
    i = group.length;
    while ( i-- ) {
      cached = matcherFromTokens( group[i] );
      if ( cached[ expando ] ) {
        setMatchers.push( cached );
      } else {
        elementMatchers.push( cached );
      }
    }

Cache the compiled function

    cached = compilerCache( selector, matcherFromGroupMatchers( elementMatchers, setMatchers ) );
  }
  return cached;
};

function multipleContexts( selector, contexts, results ) {
  var i = 0,
    len = contexts.length;
  for ( ; i < len; i++ ) {
    Sizzle( selector, contexts[i], results );
  }
  return results;
}

function select( selector, context, results, seed ) {
  var i, tokens, token, type, find,
    match = tokenize( selector );

  if ( !seed ) {

Try to minimize operations if there is only one group

    if ( match.length === 1 ) {

Take a shortcut and set the context if the root selector is an ID

      tokens = match[0] = match[0].slice( 0 );
      if ( tokens.length > 2 && (token = tokens[0]).type === "ID" &&
          context.nodeType === 9 && !documentIsXML &&
          Expr.relative[ tokens[1].type ] ) {

        context = Expr.find["ID"]( token.matches[0].replace( runescape, funescape ), context )[0];
        if ( !context ) {
          return results;
        }

        selector = selector.slice( tokens.shift().value.length );
      }

Fetch a seed set for right-to-left matching

      i = matchExpr["needsContext"].test( selector ) ? 0 : tokens.length;
      while ( i-- ) {
        token = tokens[i];

Abort if we hit a combinator

        if ( Expr.relative[ (type = token.type) ] ) {
          break;
        }
        if ( (find = Expr.find[ type ]) ) {

Search, expanding context for leading sibling combinators

          if ( (seed = find(
            token.matches[0].replace( runescape, funescape ),
            rsibling.test( tokens[0].type ) && context.parentNode || context
          )) ) {

If seed is empty or no tokens remain, we can return early

            tokens.splice( i, 1 );
            selector = seed.length && toSelector( tokens );
            if ( !selector ) {
              push.apply( results, slice.call( seed, 0 ) );
              return results;
            }

            break;
          }
        }
      }
    }
  }

Compile and execute a filtering function Provide match to avoid retokenization if we modified the selector above

  compile( selector, match )(
    seed,
    context,
    documentIsXML,
    results,
    rsibling.test( selector )
  );
  return results;
}

Deprecated

Expr.pseudos["nth"] = Expr.pseudos["eq"];

Easy API for creating new setFilters

function setFilters() {}
Expr.filters = setFilters.prototype = Expr.pseudos;
Expr.setFilters = new setFilters();

Initialize with the default document

setDocument();

Override sizzle attribute retrieval

Sizzle.attr = jQuery.attr;
jQuery.find = Sizzle;
jQuery.expr = Sizzle.selectors;
jQuery.expr[":"] = jQuery.expr.pseudos;
jQuery.unique = Sizzle.uniqueSort;
jQuery.text = Sizzle.getText;
jQuery.isXMLDoc = Sizzle.isXML;
jQuery.contains = Sizzle.contains;


})( window );
var runtil = /Until$/,
  rparentsprev = /^(?:parents|prev(?:Until|All))/,
  isSimple = /^.[^:#\[\.,]*$/,
  rneedsContext = jQuery.expr.match.needsContext,

methods guaranteed to produce a unique set when starting from a unique set

  guaranteedUnique = {
    children: true,
    contents: true,
    next: true,
    prev: true
  };

jQuery.fn.extend({
  find: function( selector ) {
    var i, ret, self,
      len = this.length;

    if ( typeof selector !== "string" ) {
      self = this;
      return this.pushStack( jQuery( selector ).filter(function() {
        for ( i = 0; i < len; i++ ) {
          if ( jQuery.contains( self[ i ], this ) ) {
            return true;
          }
        }
      }) );
    }

    ret = [];
    for ( i = 0; i < len; i++ ) {
      jQuery.find( selector, this[ i ], ret );
    }

Needed because $( selector, context ) becomes $( context ).find( selector )

    ret = this.pushStack( len > 1 ? jQuery.unique( ret ) : ret );
    ret.selector = ( this.selector ? this.selector + " " : "" ) + selector;
    return ret;
  },

  has: function( target ) {
    var i,
      targets = jQuery( target, this ),
      len = targets.length;

    return this.filter(function() {
      for ( i = 0; i < len; i++ ) {
        if ( jQuery.contains( this, targets[i] ) ) {
          return true;
        }
      }
    });
  },

  not: function( selector ) {
    return this.pushStack( winnow(this, selector, false) );
  },

  filter: function( selector ) {
    return this.pushStack( winnow(this, selector, true) );
  },

  is: function( selector ) {
    return !!selector && (
      typeof selector === "string" ?

If this is a positional/relative selector, check membership in the returned set so $("p:first").is("p:last") won't return true for a doc with two "p".

        rneedsContext.test( selector ) ?
          jQuery( selector, this.context ).index( this[0] ) >= 0 :
          jQuery.filter( selector, this ).length > 0 :
        this.filter( selector ).length > 0 );
  },

  closest: function( selectors, context ) {
    var cur,
      i = 0,
      l = this.length,
      ret = [],
      pos = rneedsContext.test( selectors ) || typeof selectors !== "string" ?
        jQuery( selectors, context || this.context ) :
        0;

    for ( ; i < l; i++ ) {
      cur = this[i];

      while ( cur && cur.ownerDocument && cur !== context && cur.nodeType !== 11 ) {
        if ( pos ? pos.index(cur) > -1 : jQuery.find.matchesSelector(cur, selectors) ) {
          ret.push( cur );
          break;
        }
        cur = cur.parentNode;
      }
    }

    return this.pushStack( ret.length > 1 ? jQuery.unique( ret ) : ret );
  },

Determine the position of an element within the matched set of elements

  index: function( elem ) {

No argument, return index in parent

    if ( !elem ) {
      return ( this[0] && this[0].parentNode ) ? this.first().prevAll().length : -1;
    }

index in selector

    if ( typeof elem === "string" ) {
      return jQuery.inArray( this[0], jQuery( elem ) );
    }

Locate the position of the desired element

    return jQuery.inArray(

If it receives a jQuery object, the first element is used

      elem.jquery ? elem[0] : elem, this );
  },

  add: function( selector, context ) {
    var set = typeof selector === "string" ?
        jQuery( selector, context ) :
        jQuery.makeArray( selector && selector.nodeType ? [ selector ] : selector ),
      all = jQuery.merge( this.get(), set );

    return this.pushStack( jQuery.unique(all) );
  },

  addBack: function( selector ) {
    return this.add( selector == null ?
      this.prevObject : this.prevObject.filter(selector)
    );
  }
});

jQuery.fn.andSelf = jQuery.fn.addBack;

function sibling( cur, dir ) {
  do {
    cur = cur[ dir ];
  } while ( cur && cur.nodeType !== 1 );

  return cur;
}

jQuery.each({
  parent: function( elem ) {
    var parent = elem.parentNode;
    return parent && parent.nodeType !== 11 ? parent : null;
  },
  parents: function( elem ) {
    return jQuery.dir( elem, "parentNode" );
  },
  parentsUntil: function( elem, i, until ) {
    return jQuery.dir( elem, "parentNode", until );
  },
  next: function( elem ) {
    return sibling( elem, "nextSibling" );
  },
  prev: function( elem ) {
    return sibling( elem, "previousSibling" );
  },
  nextAll: function( elem ) {
    return jQuery.dir( elem, "nextSibling" );
  },
  prevAll: function( elem ) {
    return jQuery.dir( elem, "previousSibling" );
  },
  nextUntil: function( elem, i, until ) {
    return jQuery.dir( elem, "nextSibling", until );
  },
  prevUntil: function( elem, i, until ) {
    return jQuery.dir( elem, "previousSibling", until );
  },
  siblings: function( elem ) {
    return jQuery.sibling( ( elem.parentNode || {} ).firstChild, elem );
  },
  children: function( elem ) {
    return jQuery.sibling( elem.firstChild );
  },
  contents: function( elem ) {
    return jQuery.nodeName( elem, "iframe" ) ?
      elem.contentDocument || elem.contentWindow.document :
      jQuery.merge( [], elem.childNodes );
  }
}, function( name, fn ) {
  jQuery.fn[ name ] = function( until, selector ) {
    var ret = jQuery.map( this, fn, until );

    if ( !runtil.test( name ) ) {
      selector = until;
    }

    if ( selector && typeof selector === "string" ) {
      ret = jQuery.filter( selector, ret );
    }

    ret = this.length > 1 && !guaranteedUnique[ name ] ? jQuery.unique( ret ) : ret;

    if ( this.length > 1 && rparentsprev.test( name ) ) {
      ret = ret.reverse();
    }

    return this.pushStack( ret );
  };
});

jQuery.extend({
  filter: function( expr, elems, not ) {
    if ( not ) {
      expr = ":not(" + expr + ")";
    }

    return elems.length === 1 ?
      jQuery.find.matchesSelector(elems[0], expr) ? [ elems[0] ] : [] :
      jQuery.find.matches(expr, elems);
  },

  dir: function( elem, dir, until ) {
    var matched = [],
      cur = elem[ dir ];

    while ( cur && cur.nodeType !== 9 && (until === undefined || cur.nodeType !== 1 || !jQuery( cur ).is( until )) ) {
      if ( cur.nodeType === 1 ) {
        matched.push( cur );
      }
      cur = cur[dir];
    }
    return matched;
  },

  sibling: function( n, elem ) {
    var r = [];

    for ( ; n; n = n.nextSibling ) {
      if ( n.nodeType === 1 && n !== elem ) {
        r.push( n );
      }
    }

    return r;
  }
});

Implement the identical functionality for filter and not

function winnow( elements, qualifier, keep ) {

Can't pass null or undefined to indexOf in Firefox 4 Set to 0 to skip string check

  qualifier = qualifier || 0;

  if ( jQuery.isFunction( qualifier ) ) {
    return jQuery.grep(elements, function( elem, i ) {
      var retVal = !!qualifier.call( elem, i, elem );
      return retVal === keep;
    });

  } else if ( qualifier.nodeType ) {
    return jQuery.grep(elements, function( elem ) {
      return ( elem === qualifier ) === keep;
    });

  } else if ( typeof qualifier === "string" ) {
    var filtered = jQuery.grep(elements, function( elem ) {
      return elem.nodeType === 1;
    });

    if ( isSimple.test( qualifier ) ) {
      return jQuery.filter(qualifier, filtered, !keep);
    } else {
      qualifier = jQuery.filter( qualifier, filtered );
    }
  }

  return jQuery.grep(elements, function( elem ) {
    return ( jQuery.inArray( elem, qualifier ) >= 0 ) === keep;
  });
}
function createSafeFragment( document ) {
  var list = nodeNames.split( "|" ),
    safeFrag = document.createDocumentFragment();

  if ( safeFrag.createElement ) {
    while ( list.length ) {
      safeFrag.createElement(
        list.pop()
      );
    }
  }
  return safeFrag;
}

var nodeNames = "abbr|article|aside|audio|bdi|canvas|data|datalist|details|figcaption|figure|footer|" +
    "header|hgroup|mark|meter|nav|output|progress|section|summary|time|video",
  rinlinejQuery = / jQuery\d+="(?:null|\d+)"/g,
  rnoshimcache = new RegExp("<(?:" + nodeNames + ")[\\s/>]", "i"),
  rleadingWhitespace = /^\s+/,
  rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/gi,
  rtagName = /<([\w:]+)/,
  rtbody = /<tbody/i,
  rhtml = /<|&#?\w+;/,
  rnoInnerhtml = /<(?:script|style|link)/i,
  manipulation_rcheckableType = /^(?:checkbox|radio)$/i,

checked="checked" or checked

  rchecked = /checked\s*(?:[^=]|=\s*.checked.)/i,
  rscriptType = /^$|\/(?:java|ecma)script/i,
  rscriptTypeMasked = /^true\/(.*)/,
  rcleanScript = /^\s*<!(?:\[CDATA\[|--)|(?:\]\]|--)>\s*$/g,

We have to close these tags to support XHTML (#13200)

  wrapMap = {
    option: [ 1, "<select multiple='multiple'>", "</select>" ],
    legend: [ 1, "<fieldset>", "</fieldset>" ],
    area: [ 1, "<map>", "</map>" ],
    param: [ 1, "<object>", "</object>" ],
    thead: [ 1, "<table>", "</table>" ],
    tr: [ 2, "<table><tbody>", "</tbody></table>" ],
    col: [ 2, "<table><tbody></tbody><colgroup>", "</colgroup></table>" ],
    td: [ 3, "<table><tbody><tr>", "</tr></tbody></table>" ],

IE6-8 can't serialize link, script, style, or any html5 (NoScope) tags, unless wrapped in a div with non-breaking characters in front of it.

    _default: jQuery.support.htmlSerialize ? [ 0, "", "" ] : [ 1, "X<div>", "</div>"  ]
  },
  safeFragment = createSafeFragment( document ),
  fragmentDiv = safeFragment.appendChild( document.createElement("div") );

wrapMap.optgroup = wrapMap.option;
wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
wrapMap.th = wrapMap.td;

jQuery.fn.extend({
  text: function( value ) {
    return jQuery.access( this, function( value ) {
      return value === undefined ?
        jQuery.text( this ) :
        this.empty().append( ( this[0] && this[0].ownerDocument || document ).createTextNode( value ) );
    }, null, value, arguments.length );
  },

  wrapAll: function( html ) {
    if ( jQuery.isFunction( html ) ) {
      return this.each(function(i) {
        jQuery(this).wrapAll( html.call(this, i) );
      });
    }

    if ( this[0] ) {

The elements to wrap the target around

      var wrap = jQuery( html, this[0].ownerDocument ).eq(0).clone(true);

      if ( this[0].parentNode ) {
        wrap.insertBefore( this[0] );
      }

      wrap.map(function() {
        var elem = this;

        while ( elem.firstChild && elem.firstChild.nodeType === 1 ) {
          elem = elem.firstChild;
        }

        return elem;
      }).append( this );
    }

    return this;
  },

  wrapInner: function( html ) {
    if ( jQuery.isFunction( html ) ) {
      return this.each(function(i) {
        jQuery(this).wrapInner( html.call(this, i) );
      });
    }

    return this.each(function() {
      var self = jQuery( this ),
        contents = self.contents();

      if ( contents.length ) {
        contents.wrapAll( html );

      } else {
        self.append( html );
      }
    });
  },

  wrap: function( html ) {
    var isFunction = jQuery.isFunction( html );

    return this.each(function(i) {
      jQuery( this ).wrapAll( isFunction ? html.call(this, i) : html );
    });
  },

  unwrap: function() {
    return this.parent().each(function() {
      if ( !jQuery.nodeName( this, "body" ) ) {
        jQuery( this ).replaceWith( this.childNodes );
      }
    }).end();
  },

  append: function() {
    return this.domManip(arguments, true, function( elem ) {
      if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
        this.appendChild( elem );
      }
    });
  },

  prepend: function() {
    return this.domManip(arguments, true, function( elem ) {
      if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
        this.insertBefore( elem, this.firstChild );
      }
    });
  },

  before: function() {
    return this.domManip( arguments, false, function( elem ) {
      if ( this.parentNode ) {
        this.parentNode.insertBefore( elem, this );
      }
    });
  },

  after: function() {
    return this.domManip( arguments, false, function( elem ) {
      if ( this.parentNode ) {
        this.parentNode.insertBefore( elem, this.nextSibling );
      }
    });
  },

keepData is for internal use only--do not document

  remove: function( selector, keepData ) {
    var elem,
      i = 0;

    for ( ; (elem = this[i]) != null; i++ ) {
      if ( !selector || jQuery.filter( selector, [ elem ] ).length > 0 ) {
        if ( !keepData && elem.nodeType === 1 ) {
          jQuery.cleanData( getAll( elem ) );
        }

        if ( elem.parentNode ) {
          if ( keepData && jQuery.contains( elem.ownerDocument, elem ) ) {
            setGlobalEval( getAll( elem, "script" ) );
          }
          elem.parentNode.removeChild( elem );
        }
      }
    }

    return this;
  },

  empty: function() {
    var elem,
      i = 0;

    for ( ; (elem = this[i]) != null; i++ ) {

Remove element nodes and prevent memory leaks

      if ( elem.nodeType === 1 ) {
        jQuery.cleanData( getAll( elem, false ) );
      }

Remove any remaining nodes

      while ( elem.firstChild ) {
        elem.removeChild( elem.firstChild );
      }

If this is a select, ensure that it displays empty (#12336) Support: IE<9

      if ( elem.options && jQuery.nodeName( elem, "select" ) ) {
        elem.options.length = 0;
      }
    }

    return this;
  },

  clone: function( dataAndEvents, deepDataAndEvents ) {
    dataAndEvents = dataAndEvents == null ? false : dataAndEvents;
    deepDataAndEvents = deepDataAndEvents == null ? dataAndEvents : deepDataAndEvents;

    return this.map( function () {
      return jQuery.clone( this, dataAndEvents, deepDataAndEvents );
    });
  },

  html: function( value ) {
    return jQuery.access( this, function( value ) {
      var elem = this[0] || {},
        i = 0,
        l = this.length;

      if ( value === undefined ) {
        return elem.nodeType === 1 ?
          elem.innerHTML.replace( rinlinejQuery, "" ) :
          undefined;
      }

See if we can take a shortcut and just use innerHTML

      if ( typeof value === "string" && !rnoInnerhtml.test( value ) &&
        ( jQuery.support.htmlSerialize || !rnoshimcache.test( value )  ) &&
        ( jQuery.support.leadingWhitespace || !rleadingWhitespace.test( value ) ) &&
        !wrapMap[ ( rtagName.exec( value ) || ["", ""] )[1].toLowerCase() ] ) {

        value = value.replace( rxhtmlTag, "<$1></$2>" );

        try {
          for (; i < l; i++ ) {

Remove element nodes and prevent memory leaks

            elem = this[i] || {};
            if ( elem.nodeType === 1 ) {
              jQuery.cleanData( getAll( elem, false ) );
              elem.innerHTML = value;
            }
          }

          elem = 0;

If using innerHTML throws an exception, use the fallback method

        } catch(e) {}
      }

      if ( elem ) {
        this.empty().append( value );
      }
    }, null, value, arguments.length );
  },

  replaceWith: function( value ) {
    var isFunc = jQuery.isFunction( value );

Make sure that the elements are removed from the DOM before they are inserted this can help fix replacing a parent with child elements

    if ( !isFunc && typeof value !== "string" ) {
      value = jQuery( value ).not( this ).detach();
    }

    return this.domManip( [ value ], true, function( elem ) {
      var next = this.nextSibling,
        parent = this.parentNode;

      if ( parent ) {
        jQuery( this ).remove();
        parent.insertBefore( elem, next );
      }
    });
  },

  detach: function( selector ) {
    return this.remove( selector, true );
  },

  domManip: function( args, table, callback ) {

Flatten any nested arrays

    args = core_concat.apply( [], args );

    var first, node, hasScripts,
      scripts, doc, fragment,
      i = 0,
      l = this.length,
      set = this,
      iNoClone = l - 1,
      value = args[0],
      isFunction = jQuery.isFunction( value );

We can't cloneNode fragments that contain checked, in WebKit

    if ( isFunction || !( l <= 1 || typeof value !== "string" || jQuery.support.checkClone || !rchecked.test( value ) ) ) {
      return this.each(function( index ) {
        var self = set.eq( index );
        if ( isFunction ) {
          args[0] = value.call( this, index, table ? self.html() : undefined );
        }
        self.domManip( args, table, callback );
      });
    }

    if ( l ) {
      fragment = jQuery.buildFragment( args, this[ 0 ].ownerDocument, false, this );
      first = fragment.firstChild;

      if ( fragment.childNodes.length === 1 ) {
        fragment = first;
      }

      if ( first ) {
        table = table && jQuery.nodeName( first, "tr" );
        scripts = jQuery.map( getAll( fragment, "script" ), disableScript );
        hasScripts = scripts.length;

Use the original fragment for the last item instead of the first because it can end up being emptied incorrectly in certain situations (#8070).

        for ( ; i < l; i++ ) {
          node = fragment;

          if ( i !== iNoClone ) {
            node = jQuery.clone( node, true, true );

Keep references to cloned scripts for later restoration

            if ( hasScripts ) {
              jQuery.merge( scripts, getAll( node, "script" ) );
            }
          }

          callback.call(
            table && jQuery.nodeName( this[i], "table" ) ?
              findOrAppend( this[i], "tbody" ) :
              this[i],
            node,
            i
          );
        }

        if ( hasScripts ) {
          doc = scripts[ scripts.length - 1 ].ownerDocument;

Reenable scripts

          jQuery.map( scripts, restoreScript );

Evaluate executable scripts on first document insertion

          for ( i = 0; i < hasScripts; i++ ) {
            node = scripts[ i ];
            if ( rscriptType.test( node.type || "" ) &&
              !jQuery._data( node, "globalEval" ) && jQuery.contains( doc, node ) ) {

              if ( node.src ) {

Hope ajax is available...

                jQuery.ajax({
                  url: node.src,
                  type: "GET",
                  dataType: "script",
                  async: false,
                  global: false,
                  "throws": true
                });
              } else {
                jQuery.globalEval( ( node.text || node.textContent || node.innerHTML || "" ).replace( rcleanScript, "" ) );
              }
            }
          }
        }

Fix #11809: Avoid leaking memory

        fragment = first = null;
      }
    }

    return this;
  }
});

function findOrAppend( elem, tag ) {
  return elem.getElementsByTagName( tag )[0] || elem.appendChild( elem.ownerDocument.createElement( tag ) );
}

Replace/restore the type attribute of script elements for safe DOM manipulation

function disableScript( elem ) {
  var attr = elem.getAttributeNode("type");
  elem.type = ( attr && attr.specified ) + "/" + elem.type;
  return elem;
}
function restoreScript( elem ) {
  var match = rscriptTypeMasked.exec( elem.type );
  if ( match ) {
    elem.type = match[1];
  } else {
    elem.removeAttribute("type");
  }
  return elem;
}

Mark scripts as having already been evaluated

function setGlobalEval( elems, refElements ) {
  var elem,
    i = 0;
  for ( ; (elem = elems[i]) != null; i++ ) {
    jQuery._data( elem, "globalEval", !refElements || jQuery._data( refElements[i], "globalEval" ) );
  }
}

function cloneCopyEvent( src, dest ) {

  if ( dest.nodeType !== 1 || !jQuery.hasData( src ) ) {
    return;
  }

  var type, i, l,
    oldData = jQuery._data( src ),
    curData = jQuery._data( dest, oldData ),
    events = oldData.events;

  if ( events ) {
    delete curData.handle;
    curData.events = {};

    for ( type in events ) {
      for ( i = 0, l = events[ type ].length; i < l; i++ ) {
        jQuery.event.add( dest, type, events[ type ][ i ] );
      }
    }
  }

make the cloned public data object a copy from the original

  if ( curData.data ) {
    curData.data = jQuery.extend( {}, curData.data );
  }
}

function fixCloneNodeIssues( src, dest ) {
  var nodeName, e, data;

We do not need to do anything for non-Elements

  if ( dest.nodeType !== 1 ) {
    return;
  }

  nodeName = dest.nodeName.toLowerCase();

IE6-8 copies events bound via attachEvent when using cloneNode.

  if ( !jQuery.support.noCloneEvent && dest[ jQuery.expando ] ) {
    data = jQuery._data( dest );

    for ( e in data.events ) {
      jQuery.removeEvent( dest, e, data.handle );
    }

Event data gets referenced instead of copied if the expando gets copied too

    dest.removeAttribute( jQuery.expando );
  }

IE blanks contents when cloning scripts, and tries to evaluate newly-set text

  if ( nodeName === "script" && dest.text !== src.text ) {
    disableScript( dest ).text = src.text;
    restoreScript( dest );

IE6-10 improperly clones children of object elements using classid. IE10 throws NoModificationAllowedError if parent is null, #12132.

  } else if ( nodeName === "object" ) {
    if ( dest.parentNode ) {
      dest.outerHTML = src.outerHTML;
    }

This path appears unavoidable for IE9. When cloning an object element in IE9, the outerHTML strategy above is not sufficient. If the src has innerHTML and the destination does not, copy the src.innerHTML into the dest.innerHTML. #10324

    if ( jQuery.support.html5Clone && ( src.innerHTML && !jQuery.trim(dest.innerHTML) ) ) {
      dest.innerHTML = src.innerHTML;
    }

  } else if ( nodeName === "input" && manipulation_rcheckableType.test( src.type ) ) {

IE6-8 fails to persist the checked state of a cloned checkbox or radio button. Worse, IE6-7 fail to give the cloned element a checked appearance if the defaultChecked value isn't also set

    dest.defaultChecked = dest.checked = src.checked;

IE6-7 get confused and end up setting the value of a cloned checkbox/radio button to an empty string instead of "on"

    if ( dest.value !== src.value ) {
      dest.value = src.value;
    }

IE6-8 fails to return the selected option to the default selected state when cloning options

  } else if ( nodeName === "option" ) {
    dest.defaultSelected = dest.selected = src.defaultSelected;

IE6-8 fails to set the defaultValue to the correct value when cloning other types of input fields

  } else if ( nodeName === "input" || nodeName === "textarea" ) {
    dest.defaultValue = src.defaultValue;
  }
}

jQuery.each({
  appendTo: "append",
  prependTo: "prepend",
  insertBefore: "before",
  insertAfter: "after",
  replaceAll: "replaceWith"
}, function( name, original ) {
  jQuery.fn[ name ] = function( selector ) {
    var elems,
      i = 0,
      ret = [],
      insert = jQuery( selector ),
      last = insert.length - 1;

    for ( ; i <= last; i++ ) {
      elems = i === last ? this : this.clone(true);
      jQuery( insert[i] )[ original ]( elems );

Modern browsers can apply jQuery collections as arrays, but oldIE needs a .get()

      core_push.apply( ret, elems.get() );
    }

    return this.pushStack( ret );
  };
});

function getAll( context, tag ) {
  var elems, elem,
    i = 0,
    found = typeof context.getElementsByTagName !== core_strundefined ? context.getElementsByTagName( tag || "*" ) :
      typeof context.querySelectorAll !== core_strundefined ? context.querySelectorAll( tag || "*" ) :
      undefined;

  if ( !found ) {
    for ( found = [], elems = context.childNodes || context; (elem = elems[i]) != null; i++ ) {
      if ( !tag || jQuery.nodeName( elem, tag ) ) {
        found.push( elem );
      } else {
        jQuery.merge( found, getAll( elem, tag ) );
      }
    }
  }

  return tag === undefined || tag && jQuery.nodeName( context, tag ) ?
    jQuery.merge( [ context ], found ) :
    found;
}

Used in buildFragment, fixes the defaultChecked property

function fixDefaultChecked( elem ) {
  if ( manipulation_rcheckableType.test( elem.type ) ) {
    elem.defaultChecked = elem.checked;
  }
}

jQuery.extend({
  clone: function( elem, dataAndEvents, deepDataAndEvents ) {
    var destElements, node, clone, i, srcElements,
      inPage = jQuery.contains( elem.ownerDocument, elem );

    if ( jQuery.support.html5Clone || jQuery.isXMLDoc(elem) || !rnoshimcache.test( "<" + elem.nodeName + ">" ) ) {
      clone = elem.cloneNode( true );

IE<=8 does not properly clone detached, unknown element nodes

    } else {
      fragmentDiv.innerHTML = elem.outerHTML;
      fragmentDiv.removeChild( clone = fragmentDiv.firstChild );
    }

    if ( (!jQuery.support.noCloneEvent || !jQuery.support.noCloneChecked) &&
        (elem.nodeType === 1 || elem.nodeType === 11) && !jQuery.isXMLDoc(elem) ) {

We eschew Sizzle here for performance reasons: http://jsperf.com/getall-vs-sizzle/2

      destElements = getAll( clone );
      srcElements = getAll( elem );

Fix all IE cloning issues

      for ( i = 0; (node = srcElements[i]) != null; ++i ) {

Ensure that the destination node is not null; Fixes #9587

        if ( destElements[i] ) {
          fixCloneNodeIssues( node, destElements[i] );
        }
      }
    }

Copy the events from the original to the clone

    if ( dataAndEvents ) {
      if ( deepDataAndEvents ) {
        srcElements = srcElements || getAll( elem );
        destElements = destElements || getAll( clone );

        for ( i = 0; (node = srcElements[i]) != null; i++ ) {
          cloneCopyEvent( node, destElements[i] );
        }
      } else {
        cloneCopyEvent( elem, clone );
      }
    }

Preserve script evaluation history

    destElements = getAll( clone, "script" );
    if ( destElements.length > 0 ) {
      setGlobalEval( destElements, !inPage && getAll( elem, "script" ) );
    }

    destElements = srcElements = node = null;

Return the cloned set

    return clone;
  },

  buildFragment: function( elems, context, scripts, selection ) {
    var j, elem, contains,
      tmp, tag, tbody, wrap,
      l = elems.length,

Ensure a safe fragment

      safe = createSafeFragment( context ),

      nodes = [],
      i = 0;

    for ( ; i < l; i++ ) {
      elem = elems[ i ];

      if ( elem || elem === 0 ) {

Add nodes directly

        if ( jQuery.type( elem ) === "object" ) {
          jQuery.merge( nodes, elem.nodeType ? [ elem ] : elem );

Convert non-html into a text node

        } else if ( !rhtml.test( elem ) ) {
          nodes.push( context.createTextNode( elem ) );

Convert html into DOM nodes

        } else {
          tmp = tmp || safe.appendChild( context.createElement("div") );

Deserialize a standard representation

          tag = ( rtagName.exec( elem ) || ["", ""] )[1].toLowerCase();
          wrap = wrapMap[ tag ] || wrapMap._default;

          tmp.innerHTML = wrap[1] + elem.replace( rxhtmlTag, "<$1></$2>" ) + wrap[2];

Descend through wrappers to the right content

          j = wrap[0];
          while ( j-- ) {
            tmp = tmp.lastChild;
          }

Manually add leading whitespace removed by IE

          if ( !jQuery.support.leadingWhitespace && rleadingWhitespace.test( elem ) ) {
            nodes.push( context.createTextNode( rleadingWhitespace.exec( elem )[0] ) );
          }

Remove IE's autoinserted <tbody> from table fragments

          if ( !jQuery.support.tbody ) {

String was a <table>, may have spurious <tbody>

            elem = tag === "table" && !rtbody.test( elem ) ?
              tmp.firstChild :

String was a bare <thead> or <tfoot>

              wrap[1] === "<table>" && !rtbody.test( elem ) ?
                tmp :
                0;

            j = elem && elem.childNodes.length;
            while ( j-- ) {
              if ( jQuery.nodeName( (tbody = elem.childNodes[j]), "tbody" ) && !tbody.childNodes.length ) {
                elem.removeChild( tbody );
              }
            }
          }

          jQuery.merge( nodes, tmp.childNodes );

Fix #12392 for WebKit and IE > 9

          tmp.textContent = "";

Fix #12392 for oldIE

          while ( tmp.firstChild ) {
            tmp.removeChild( tmp.firstChild );
          }

Remember the top-level container for proper cleanup

          tmp = safe.lastChild;
        }
      }
    }

Fix #11356: Clear elements from fragment

    if ( tmp ) {
      safe.removeChild( tmp );
    }

Reset defaultChecked for any radios and checkboxes about to be appended to the DOM in IE 6/7 (#8060)

    if ( !jQuery.support.appendChecked ) {
      jQuery.grep( getAll( nodes, "input" ), fixDefaultChecked );
    }

    i = 0;
    while ( (elem = nodes[ i++ ]) ) {

#4087 - If origin and destination elements are the same, and this is that element, do not do anything

      if ( selection && jQuery.inArray( elem, selection ) !== -1 ) {
        continue;
      }

      contains = jQuery.contains( elem.ownerDocument, elem );

Append to fragment

      tmp = getAll( safe.appendChild( elem ), "script" );

Preserve script evaluation history

      if ( contains ) {
        setGlobalEval( tmp );
      }

Capture executables

      if ( scripts ) {
        j = 0;
        while ( (elem = tmp[ j++ ]) ) {
          if ( rscriptType.test( elem.type || "" ) ) {
            scripts.push( elem );
          }
        }
      }
    }

    tmp = null;

    return safe;
  },

  cleanData: function( elems, // internal acceptData ) {
    var elem, type, id, data,
      i = 0,
      internalKey = jQuery.expando,
      cache = jQuery.cache,
      deleteExpando = jQuery.support.deleteExpando,
      special = jQuery.event.special;

    for ( ; (elem = elems[i]) != null; i++ ) {

      if ( acceptData || jQuery.acceptData( elem ) ) {

        id = elem[ internalKey ];
        data = id && cache[ id ];

        if ( data ) {
          if ( data.events ) {
            for ( type in data.events ) {
              if ( special[ type ] ) {
                jQuery.event.remove( elem, type );

This is a shortcut to avoid jQuery.event.remove's overhead

              } else {
                jQuery.removeEvent( elem, type, data.handle );
              }
            }
          }

Remove cache only if it was not already removed by jQuery.event.remove

          if ( cache[ id ] ) {

            delete cache[ id ];

IE does not allow us to delete expando properties from nodes, nor does it have a removeAttribute function on Document nodes; we must handle all of these cases

            if ( deleteExpando ) {
              delete elem[ internalKey ];

            } else if ( typeof elem.removeAttribute !== core_strundefined ) {
              elem.removeAttribute( internalKey );

            } else {
              elem[ internalKey ] = null;
            }

            core_deletedIds.push( id );
          }
        }
      }
    }
  }
});
var iframe, getStyles, curCSS,
  ralpha = /alpha\([^)]*\)/i,
  ropacity = /opacity\s*=\s*([^)]*)/,
  rposition = /^(top|right|bottom|left)$/,

swappable if display is none or starts with table except "table", "table-cell", or "table-caption" see here for display values: https://developer.mozilla.org/en-US/docs/CSS/display

  rdisplayswap = /^(none|table(?!-c[ea]).+)/,
  rmargin = /^margin/,
  rnumsplit = new RegExp( "^(" + core_pnum + ")(.*)$", "i" ),
  rnumnonpx = new RegExp( "^(" + core_pnum + ")(?!px)[a-z%]+$", "i" ),
  rrelNum = new RegExp( "^([+-])=(" + core_pnum + ")", "i" ),
  elemdisplay = { BODY: "block" },

  cssShow = { position: "absolute", visibility: "hidden", display: "block" },
  cssNormalTransform = {
    letterSpacing: 0,
    fontWeight: 400
  },

  cssExpand = [ "Top", "Right", "Bottom", "Left" ],
  cssPrefixes = [ "Webkit", "O", "Moz", "ms" ];

return a css property mapped to a potentially vendor prefixed property

function vendorPropName( style, name ) {

shortcut for names that are not vendor prefixed

  if ( name in style ) {
    return name;
  }

check for vendor prefixed names

  var capName = name.charAt(0).toUpperCase() + name.slice(1),
    origName = name,
    i = cssPrefixes.length;

  while ( i-- ) {
    name = cssPrefixes[ i ] + capName;
    if ( name in style ) {
      return name;
    }
  }

  return origName;
}

function isHidden( elem, el ) {

isHidden might be called from jQuery#filter function; in that case, element will be second argument

  elem = el || elem;
  return jQuery.css( elem, "display" ) === "none" || !jQuery.contains( elem.ownerDocument, elem );
}

function showHide( elements, show ) {
  var display, elem, hidden,
    values = [],
    index = 0,
    length = elements.length;

  for ( ; index < length; index++ ) {
    elem = elements[ index ];
    if ( !elem.style ) {
      continue;
    }

    values[ index ] = jQuery._data( elem, "olddisplay" );
    display = elem.style.display;
    if ( show ) {

Reset the inline display of this element to learn if it is being hidden by cascaded rules or not

      if ( !values[ index ] && display === "none" ) {
        elem.style.display = "";
      }

Set elements which have been overridden with display: none in a stylesheet to whatever the default browser style is for such an element

      if ( elem.style.display === "" && isHidden( elem ) ) {
        values[ index ] = jQuery._data( elem, "olddisplay", css_defaultDisplay(elem.nodeName) );
      }
    } else {

      if ( !values[ index ] ) {
        hidden = isHidden( elem );

        if ( display && display !== "none" || !hidden ) {
          jQuery._data( elem, "olddisplay", hidden ? display : jQuery.css( elem, "display" ) );
        }
      }
    }
  }

Set the display of most of the elements in a second loop to avoid the constant reflow

  for ( index = 0; index < length; index++ ) {
    elem = elements[ index ];
    if ( !elem.style ) {
      continue;
    }
    if ( !show || elem.style.display === "none" || elem.style.display === "" ) {
      elem.style.display = show ? values[ index ] || "" : "none";
    }
  }

  return elements;
}

jQuery.fn.extend({
  css: function( name, value ) {
    return jQuery.access( this, function( elem, name, value ) {
      var len, styles,
        map = {},
        i = 0;

      if ( jQuery.isArray( name ) ) {
        styles = getStyles( elem );
        len = name.length;

        for ( ; i < len; i++ ) {
          map[ name[ i ] ] = jQuery.css( elem, name[ i ], false, styles );
        }

        return map;
      }

      return value !== undefined ?
        jQuery.style( elem, name, value ) :
        jQuery.css( elem, name );
    }, name, value, arguments.length > 1 );
  },
  show: function() {
    return showHide( this, true );
  },
  hide: function() {
    return showHide( this );
  },
  toggle: function( state ) {
    var bool = typeof state === "boolean";

    return this.each(function() {
      if ( bool ? state : isHidden( this ) ) {
        jQuery( this ).show();
      } else {
        jQuery( this ).hide();
      }
    });
  }
});

jQuery.extend({

Add in style property hooks for overriding the default behavior of getting and setting a style property

  cssHooks: {
    opacity: {
      get: function( elem, computed ) {
        if ( computed ) {

We should always get a number back from opacity

          var ret = curCSS( elem, "opacity" );
          return ret === "" ? "1" : ret;
        }
      }
    }
  },

Exclude the following css properties to add px

  cssNumber: {
    "columnCount": true,
    "fillOpacity": true,
    "fontWeight": true,
    "lineHeight": true,
    "opacity": true,
    "orphans": true,
    "widows": true,
    "zIndex": true,
    "zoom": true
  },

Add in properties whose names you wish to fix before setting or getting the value

  cssProps: {

normalize float css property

    "float": jQuery.support.cssFloat ? "cssFloat" : "styleFloat"
  },

Get and set the style property on a DOM Node

  style: function( elem, name, value, extra ) {

Don't set styles on text and comment nodes

    if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 || !elem.style ) {
      return;
    }

Make sure that we're working with the right name

    var ret, type, hooks,
      origName = jQuery.camelCase( name ),
      style = elem.style;

    name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( style, origName ) );

gets hook for the prefixed version followed by the unprefixed version

    hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];

Check if we're setting a value

    if ( value !== undefined ) {
      type = typeof value;

convert relative number strings (+= or -=) to relative numbers. #7345

      if ( type === "string" && (ret = rrelNum.exec( value )) ) {
        value = ( ret[1] + 1 ) * ret[2] + parseFloat( jQuery.css( elem, name ) );

Fixes bug #9237

        type = "number";
      }

Make sure that NaN and null values aren't set. See: #7116

      if ( value == null || type === "number" && isNaN( value ) ) {
        return;
      }

If a number was passed in, add 'px' to the (except for certain CSS properties)

      if ( type === "number" && !jQuery.cssNumber[ origName ] ) {
        value += "px";
      }

Fixes #8908, it can be done more correctly by specifing setters in cssHooks, but it would mean to define eight (for every problematic property) identical functions

      if ( !jQuery.support.clearCloneStyle && value === "" && name.indexOf("background") === 0 ) {
        style[ name ] = "inherit";
      }

If a hook was provided, use that value, otherwise just set the specified value

      if ( !hooks || !("set" in hooks) || (value = hooks.set( elem, value, extra )) !== undefined ) {

Wrapped to prevent IE from throwing errors when 'invalid' values are provided Fixes bug #5509

        try {
          style[ name ] = value;
        } catch(e) {}
      }

    } else {

If a hook was provided get the non-computed value from there

      if ( hooks && "get" in hooks && (ret = hooks.get( elem, false, extra )) !== undefined ) {
        return ret;
      }

Otherwise just get the value from the style object

      return style[ name ];
    }
  },

  css: function( elem, name, extra, styles ) {
    var num, val, hooks,
      origName = jQuery.camelCase( name );

Make sure that we're working with the right name

    name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( elem.style, origName ) );

gets hook for the prefixed version followed by the unprefixed version

    hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];

If a hook was provided get the computed value from there

    if ( hooks && "get" in hooks ) {
      val = hooks.get( elem, true, extra );
    }

Otherwise, if a way to get the computed value exists, use that

    if ( val === undefined ) {
      val = curCSS( elem, name, styles );
    }

convert "normal" to computed value

    if ( val === "normal" && name in cssNormalTransform ) {
      val = cssNormalTransform[ name ];
    }

Return, converting to number if forced or a qualifier was provided and val looks numeric

    if ( extra === "" || extra ) {
      num = parseFloat( val );
      return extra === true || jQuery.isNumeric( num ) ? num || 0 : val;
    }
    return val;
  },

A method for quickly swapping in/out CSS properties to get correct calculations

  swap: function( elem, options, callback, args ) {
    var ret, name,
      old = {};

Remember the old values, and insert the new ones

    for ( name in options ) {
      old[ name ] = elem.style[ name ];
      elem.style[ name ] = options[ name ];
    }

    ret = callback.apply( elem, args || [] );

Revert the old values

    for ( name in options ) {
      elem.style[ name ] = old[ name ];
    }

    return ret;
  }
});

NOTE: we've included the "window" in window.getComputedStyle because jsdom on node.js will break without it.

if ( window.getComputedStyle ) {
  getStyles = function( elem ) {
    return window.getComputedStyle( elem, null );
  };

  curCSS = function( elem, name, _computed ) {
    var width, minWidth, maxWidth,
      computed = _computed || getStyles( elem ),

getPropertyValue is only needed for .css('filter') in IE9, see #12537

      ret = computed ? computed.getPropertyValue( name ) || computed[ name ] : undefined,
      style = elem.style;

    if ( computed ) {

      if ( ret === "" && !jQuery.contains( elem.ownerDocument, elem ) ) {
        ret = jQuery.style( elem, name );
      }

A tribute to the "awesome hack by Dean Edwards" Chrome < 17 and Safari 5.0 uses "computed value" instead of "used value" for margin-right Safari 5.1.7 (at least) returns percentage for a larger set of values, but width seems to be reliably pixels this is against the CSSOM draft spec: http://dev.w3.org/csswg/cssom/#resolved-values

      if ( rnumnonpx.test( ret ) && rmargin.test( name ) ) {

Remember the original values

        width = style.width;
        minWidth = style.minWidth;
        maxWidth = style.maxWidth;

Put in the new values to get a computed value out

        style.minWidth = style.maxWidth = style.width = ret;
        ret = computed.width;

Revert the changed values

        style.width = width;
        style.minWidth = minWidth;
        style.maxWidth = maxWidth;
      }
    }

    return ret;
  };
} else if ( document.documentElement.currentStyle ) {
  getStyles = function( elem ) {
    return elem.currentStyle;
  };

  curCSS = function( elem, name, _computed ) {
    var left, rs, rsLeft,
      computed = _computed || getStyles( elem ),
      ret = computed ? computed[ name ] : undefined,
      style = elem.style;

Avoid setting ret to empty string here so we don't default to auto

    if ( ret == null && style && style[ name ] ) {
      ret = style[ name ];
    }

From the awesome hack by Dean Edwards http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291

If we're not dealing with a regular pixel number but a number that has a weird ending, we need to convert it to pixels but not position css attributes, as those are proportional to the parent element instead and we can't measure the parent instead because it might trigger a "stacking dolls" problem

    if ( rnumnonpx.test( ret ) && !rposition.test( name ) ) {

Remember the original values

      left = style.left;
      rs = elem.runtimeStyle;
      rsLeft = rs && rs.left;

Put in the new values to get a computed value out

      if ( rsLeft ) {
        rs.left = elem.currentStyle.left;
      }
      style.left = name === "fontSize" ? "1em" : ret;
      ret = style.pixelLeft + "px";

Revert the changed values

      style.left = left;
      if ( rsLeft ) {
        rs.left = rsLeft;
      }
    }

    return ret === "" ? "auto" : ret;
  };
}

function setPositiveNumber( elem, value, subtract ) {
  var matches = rnumsplit.exec( value );
  return matches ?

Guard against undefined "subtract", e.g., when used as in cssHooks

    Math.max( 0, matches[ 1 ] - ( subtract || 0 ) ) + ( matches[ 2 ] || "px" ) :
    value;
}

function augmentWidthOrHeight( elem, name, extra, isBorderBox, styles ) {
  var i = extra === ( isBorderBox ? "border" : "content" ) ?

If we already have the right measurement, avoid augmentation

    4 :

Otherwise initialize for horizontal or vertical properties

    name === "width" ? 1 : 0,

    val = 0;

  for ( ; i < 4; i += 2 ) {

both box models exclude margin, so add it if we want it

    if ( extra === "margin" ) {
      val += jQuery.css( elem, extra + cssExpand[ i ], true, styles );
    }

    if ( isBorderBox ) {

border-box includes padding, so remove it if we want content

      if ( extra === "content" ) {
        val -= jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );
      }

at this point, extra isn't border nor margin, so remove border

      if ( extra !== "margin" ) {
        val -= jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
      }
    } else {

at this point, extra isn't content, so add padding

      val += jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );

at this point, extra isn't content nor padding, so add border

      if ( extra !== "padding" ) {
        val += jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
      }
    }
  }

  return val;
}

function getWidthOrHeight( elem, name, extra ) {

Start with offset property, which is equivalent to the border-box value

  var valueIsBorderBox = true,
    val = name === "width" ? elem.offsetWidth : elem.offsetHeight,
    styles = getStyles( elem ),
    isBorderBox = jQuery.support.boxSizing && jQuery.css( elem, "boxSizing", false, styles ) === "border-box";

some non-html elements return undefined for offsetWidth, so check for null/undefined svg - https://bugzilla.mozilla.org/showbug.cgi?id=649285 MathML - https://bugzilla.mozilla.org/showbug.cgi?id=491668

  if ( val <= 0 || val == null ) {

Fall back to computed then uncomputed css if necessary

    val = curCSS( elem, name, styles );
    if ( val < 0 || val == null ) {
      val = elem.style[ name ];
    }

Computed unit is not pixels. Stop here and return.

    if ( rnumnonpx.test(val) ) {
      return val;
    }

we need the check for style in case a browser which returns unreliable values for getComputedStyle silently falls back to the reliable elem.style

    valueIsBorderBox = isBorderBox && ( jQuery.support.boxSizingReliable || val === elem.style[ name ] );

Normalize "", auto, and prepare for extra

    val = parseFloat( val ) || 0;
  }

use the active box-sizing model to add/subtract irrelevant styles

  return ( val +
    augmentWidthOrHeight(
      elem,
      name,
      extra || ( isBorderBox ? "border" : "content" ),
      valueIsBorderBox,
      styles
    )
  ) + "px";
}

Try to determine the default display value of an element

function css_defaultDisplay( nodeName ) {
  var doc = document,
    display = elemdisplay[ nodeName ];

  if ( !display ) {
    display = actualDisplay( nodeName, doc );

If the simple way fails, read from inside an iframe

    if ( display === "none" || !display ) {

Use the already-created iframe if possible

      iframe = ( iframe ||
        jQuery("<iframe frameborder='0' width='0' height='0'/>")
        .css( "cssText", "display:block !important" )
      ).appendTo( doc.documentElement );

Always write a new HTML skeleton so Webkit and Firefox don't choke on reuse

      doc = ( iframe[0].contentWindow || iframe[0].contentDocument ).document;
      doc.write("<!doctype html><html><body>");
      doc.close();

      display = actualDisplay( nodeName, doc );
      iframe.detach();
    }

Store the correct default display

    elemdisplay[ nodeName ] = display;
  }

  return display;
}

Called ONLY from within css_defaultDisplay

function actualDisplay( name, doc ) {
  var elem = jQuery( doc.createElement( name ) ).appendTo( doc.body ),
    display = jQuery.css( elem[0], "display" );
  elem.remove();
  return display;
}

jQuery.each([ "height", "width" ], function( i, name ) {
  jQuery.cssHooks[ name ] = {
    get: function( elem, computed, extra ) {
      if ( computed ) {

certain elements can have dimension info if we invisibly show them however, it must have a current display style that would benefit from this

        return elem.offsetWidth === 0 && rdisplayswap.test( jQuery.css( elem, "display" ) ) ?
          jQuery.swap( elem, cssShow, function() {
            return getWidthOrHeight( elem, name, extra );
          }) :
          getWidthOrHeight( elem, name, extra );
      }
    },

    set: function( elem, value, extra ) {
      var styles = extra && getStyles( elem );
      return setPositiveNumber( elem, value, extra ?
        augmentWidthOrHeight(
          elem,
          name,
          extra,
          jQuery.support.boxSizing && jQuery.css( elem, "boxSizing", false, styles ) === "border-box",
          styles
        ) : 0
      );
    }
  };
});

if ( !jQuery.support.opacity ) {
  jQuery.cssHooks.opacity = {
    get: function( elem, computed ) {

IE uses filters for opacity

      return ropacity.test( (computed && elem.currentStyle ? elem.currentStyle.filter : elem.style.filter) || "" ) ?
        ( 0.01 * parseFloat( RegExp.$1 ) ) + "" :
        computed ? "1" : "";
    },

    set: function( elem, value ) {
      var style = elem.style,
        currentStyle = elem.currentStyle,
        opacity = jQuery.isNumeric( value ) ? "alpha(opacity=" + value * 100 + ")" : "",
        filter = currentStyle && currentStyle.filter || style.filter || "";

IE has trouble with opacity if it does not have layout Force it by setting the zoom level

      style.zoom = 1;

if setting opacity to 1, and no other filters exist - attempt to remove filter attribute #6652 if value === "", then remove inline opacity #12685

      if ( ( value >= 1 || value === "" ) &&
          jQuery.trim( filter.replace( ralpha, "" ) ) === "" &&
          style.removeAttribute ) {

Setting style.filter to null, "" & " " still leave "filter:" in the cssText if "filter:" is present at all, clearType is disabled, we want to avoid this style.removeAttribute is IE Only, but so apparently is this code path...

        style.removeAttribute( "filter" );

if there is no filter style applied in a css rule or unset inline opacity, we are done

        if ( value === "" || currentStyle && !currentStyle.filter ) {
          return;
        }
      }

otherwise, set new filter values

      style.filter = ralpha.test( filter ) ?
        filter.replace( ralpha, opacity ) :
        filter + " " + opacity;
    }
  };
}

These hooks cannot be added until DOM ready because the support test for it is not run until after DOM ready

jQuery(function() {
  if ( !jQuery.support.reliableMarginRight ) {
    jQuery.cssHooks.marginRight = {
      get: function( elem, computed ) {
        if ( computed ) {

WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right Work around by temporarily setting element display to inline-block

          return jQuery.swap( elem, { "display": "inline-block" },
            curCSS, [ elem, "marginRight" ] );
        }
      }
    };
  }

Webkit bug: https://bugs.webkit.org/show_bug.cgi?id=29084 getComputedStyle returns percent when specified for top/left/bottom/right rather than make the css module depend on the offset module, we just check for it here

  if ( !jQuery.support.pixelPosition && jQuery.fn.position ) {
    jQuery.each( [ "top", "left" ], function( i, prop ) {
      jQuery.cssHooks[ prop ] = {
        get: function( elem, computed ) {
          if ( computed ) {
            computed = curCSS( elem, prop );

if curCSS returns percentage, fallback to offset

            return rnumnonpx.test( computed ) ?
              jQuery( elem ).position()[ prop ] + "px" :
              computed;
          }
        }
      };
    });
  }

});

if ( jQuery.expr && jQuery.expr.filters ) {
  jQuery.expr.filters.hidden = function( elem ) {

Support: Opera <= 12.12 Opera reports offsetWidths and offsetHeights less than zero on some elements

    return elem.offsetWidth <= 0 && elem.offsetHeight <= 0 ||
      (!jQuery.support.reliableHiddenOffsets && ((elem.style && elem.style.display) || jQuery.css( elem, "display" )) === "none");
  };

  jQuery.expr.filters.visible = function( elem ) {
    return !jQuery.expr.filters.hidden( elem );
  };
}

These hooks are used by animate to expand properties

jQuery.each({
  margin: "",
  padding: "",
  border: "Width"
}, function( prefix, suffix ) {
  jQuery.cssHooks[ prefix + suffix ] = {
    expand: function( value ) {
      var i = 0,
        expanded = {},

assumes a single number if not a string

        parts = typeof value === "string" ? value.split(" ") : [ value ];

      for ( ; i < 4; i++ ) {
        expanded[ prefix + cssExpand[ i ] + suffix ] =
          parts[ i ] || parts[ i - 2 ] || parts[ 0 ];
      }

      return expanded;
    }
  };

  if ( !rmargin.test( prefix ) ) {
    jQuery.cssHooks[ prefix + suffix ].set = setPositiveNumber;
  }
});
var r20 = /%20/g,
  rbracket = /\[\]$/,
  rCRLF = /\r?\n/g,
  rsubmitterTypes = /^(?:submit|button|image|reset|file)$/i,
  rsubmittable = /^(?:input|select|textarea|keygen)/i;

jQuery.fn.extend({
  serialize: function() {
    return jQuery.param( this.serializeArray() );
  },
  serializeArray: function() {
    return this.map(function(){

Can add propHook for "elements" to filter or add form elements

      var elements = jQuery.prop( this, "elements" );
      return elements ? jQuery.makeArray( elements ) : this;
    })
    .filter(function(){
      var type = this.type;

Use .is(":disabled") so that fieldset[disabled] works

      return this.name && !jQuery( this ).is( ":disabled" ) &&
        rsubmittable.test( this.nodeName ) && !rsubmitterTypes.test( type ) &&
        ( this.checked || !manipulation_rcheckableType.test( type ) );
    })
    .map(function( i, elem ){
      var val = jQuery( this ).val();

      return val == null ?
        null :
        jQuery.isArray( val ) ?
          jQuery.map( val, function( val ){
            return { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
          }) :
          { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
    }).get();
  }
});

Serialize an array of form elements or a set of key/values into a query string

jQuery.param = function( a, traditional ) {
  var prefix,
    s = [],
    add = function( key, value ) {

If value is a function, invoke it and return its value

      value = jQuery.isFunction( value ) ? value() : ( value == null ? "" : value );
      s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
    };

Set traditional to true for jQuery <= 1.3.2 behavior.

  if ( traditional === undefined ) {
    traditional = jQuery.ajaxSettings && jQuery.ajaxSettings.traditional;
  }

If an array was passed in, assume that it is an array of form elements.

  if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {

Serialize the form elements

    jQuery.each( a, function() {
      add( this.name, this.value );
    });

  } else {

If traditional, encode the "old" way (the way 1.3.2 or older did it), otherwise encode params recursively.

    for ( prefix in a ) {
      buildParams( prefix, a[ prefix ], traditional, add );
    }
  }

Return the resulting serialization

  return s.join( "&" ).replace( r20, "+" );
};

function buildParams( prefix, obj, traditional, add ) {
  var name;

  if ( jQuery.isArray( obj ) ) {

Serialize array item.

    jQuery.each( obj, function( i, v ) {
      if ( traditional || rbracket.test( prefix ) ) {

Treat each array item as a scalar.

        add( prefix, v );

      } else {

Item is non-scalar (array or object), encode its numeric index.

        buildParams( prefix + "[" + ( typeof v === "object" ? i : "" ) + "]", v, traditional, add );
      }
    });

  } else if ( !traditional && jQuery.type( obj ) === "object" ) {

Serialize object item.

    for ( name in obj ) {
      buildParams( prefix + "[" + name + "]", obj[ name ], traditional, add );
    }

  } else {

Serialize scalar item.

    add( prefix, obj );
  }
}
jQuery.each( ("blur focus focusin focusout load resize scroll unload click dblclick " +
  "mousedown mouseup mousemove mouseover mouseout mouseenter mouseleave " +
  "change select submit keydown keypress keyup error contextmenu").split(" "), function( i, name ) {

Handle event binding

  jQuery.fn[ name ] = function( data, fn ) {
    return arguments.length > 0 ?
      this.on( name, null, data, fn ) :
      this.trigger( name );
  };
});

jQuery.fn.hover = function( fnOver, fnOut ) {
  return this.mouseenter( fnOver ).mouseleave( fnOut || fnOver );
};
var

Document location

  ajaxLocParts,
  ajaxLocation,
  ajax_nonce = jQuery.now(),

  ajax_rquery = /\?/,
  rhash = /#.*$/,
  rts = /([?&])_=[^&]*/,
  rheaders = /^(.*?):[ \t]*([^\r\n]*)\r?$/mg, // IE leaves an \r character at EOL

#7653, #8125, #8152: local protocol detection

  rlocalProtocol = /^(?:about|app|app-storage|.+-extension|file|res|widget):$/,
  rnoContent = /^(?:GET|HEAD)$/,
  rprotocol = /^\/\//,
  rurl = /^([\w.+-]+:)(?:\/\/([^\/?#:]*)(?::(\d+)|)|)/,

Keep a copy of the old load method

  _load = jQuery.fn.load,

Prefilters 1) They are useful to introduce custom dataTypes (see ajax/jsonp.js for an example) 2) These are called: - BEFORE asking for a transport - AFTER param serialization (s.data is a string if s.processData is true) 3) key is the dataType 4) the catchall symbol "" can be used 5) execution will start with transport dataType and THEN continue down to "" if needed

  prefilters = {},

Transports bindings 1) key is the dataType 2) the catchall symbol "" can be used 3) selection will start with transport dataType and THEN go to "" if needed

  transports = {},

Avoid comment-prolog char sequence (#10098); must appease lint and evade compression

  allTypes = "*/".concat("*");

#8138, IE may throw an exception when accessing a field from window.location if document.domain has been set

try {
  ajaxLocation = location.href;
} catch( e ) {

Use the href attribute of an A element since IE will modify it given document.location

  ajaxLocation = document.createElement( "a" );
  ajaxLocation.href = "";
  ajaxLocation = ajaxLocation.href;
}

Segment location into parts

ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() ) || [];

Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport

function addToPrefiltersOrTransports( structure ) {

dataTypeExpression is optional and defaults to "*"

  return function( dataTypeExpression, func ) {

    if ( typeof dataTypeExpression !== "string" ) {
      func = dataTypeExpression;
      dataTypeExpression = "*";
    }

    var dataType,
      i = 0,
      dataTypes = dataTypeExpression.toLowerCase().match( core_rnotwhite ) || [];

    if ( jQuery.isFunction( func ) ) {

For each dataType in the dataTypeExpression

      while ( (dataType = dataTypes[i++]) ) {

Prepend if requested

        if ( dataType[0] === "+" ) {
          dataType = dataType.slice( 1 ) || "*";
          (structure[ dataType ] = structure[ dataType ] || []).unshift( func );

Otherwise append

        } else {
          (structure[ dataType ] = structure[ dataType ] || []).push( func );
        }
      }
    }
  };
}

Base inspection function for prefilters and transports

function inspectPrefiltersOrTransports( structure, options, originalOptions, jqXHR ) {

  var inspected = {},
    seekingTransport = ( structure === transports );

  function inspect( dataType ) {
    var selected;
    inspected[ dataType ] = true;
    jQuery.each( structure[ dataType ] || [], function( _, prefilterOrFactory ) {
      var dataTypeOrTransport = prefilterOrFactory( options, originalOptions, jqXHR );
      if( typeof dataTypeOrTransport === "string" && !seekingTransport && !inspected[ dataTypeOrTransport ] ) {
        options.dataTypes.unshift( dataTypeOrTransport );
        inspect( dataTypeOrTransport );
        return false;
      } else if ( seekingTransport ) {
        return !( selected = dataTypeOrTransport );
      }
    });
    return selected;
  }

  return inspect( options.dataTypes[ 0 ] ) || !inspected[ "*" ] && inspect( "*" );
}

A special extend for ajax options that takes "flat" options (not to be deep extended) Fixes #9887

function ajaxExtend( target, src ) {
  var deep, key,
    flatOptions = jQuery.ajaxSettings.flatOptions || {};

  for ( key in src ) {
    if ( src[ key ] !== undefined ) {
      ( flatOptions[ key ] ? target : ( deep || (deep = {}) ) )[ key ] = src[ key ];
    }
  }
  if ( deep ) {
    jQuery.extend( true, target, deep );
  }

  return target;
}

jQuery.fn.load = function( url, params, callback ) {
  if ( typeof url !== "string" && _load ) {
    return _load.apply( this, arguments );
  }

  var selector, response, type,
    self = this,
    off = url.indexOf(" ");

  if ( off >= 0 ) {
    selector = url.slice( off, url.length );
    url = url.slice( 0, off );
  }

If it's a function

  if ( jQuery.isFunction( params ) ) {

We assume that it's the callback

    callback = params;
    params = undefined;

Otherwise, build a param string

  } else if ( params && typeof params === "object" ) {
    type = "POST";
  }

If we have elements to modify, make the request

  if ( self.length > 0 ) {
    jQuery.ajax({
      url: url,

if "type" variable is undefined, then "GET" method will be used

      type: type,
      dataType: "html",
      data: params
    }).done(function( responseText ) {

Save response for use in complete callback

      response = arguments;

      self.html( selector ?

If a selector was specified, locate the right elements in a dummy div Exclude scripts to avoid IE 'Permission Denied' errors

        jQuery("<div>").append( jQuery.parseHTML( responseText ) ).find( selector ) :

Otherwise use the full result

        responseText );

    }).complete( callback && function( jqXHR, status ) {
      self.each( callback, response || [ jqXHR.responseText, status, jqXHR ] );
    });
  }

  return this;
};

Attach a bunch of functions for handling common AJAX events

jQuery.each( [ "ajaxStart", "ajaxStop", "ajaxComplete", "ajaxError", "ajaxSuccess", "ajaxSend" ], function( i, type ){
  jQuery.fn[ type ] = function( fn ){
    return this.on( type, fn );
  };
});

jQuery.each( [ "get", "post" ], function( i, method ) {
  jQuery[ method ] = function( url, data, callback, type ) {

shift arguments if data argument was omitted

    if ( jQuery.isFunction( data ) ) {
      type = type || callback;
      callback = data;
      data = undefined;
    }

    return jQuery.ajax({
      url: url,
      type: method,
      dataType: type,
      data: data,
      success: callback
    });
  };
});

jQuery.extend({

Counter for holding the number of active queries

  active: 0,

Last-Modified header cache for next request

  lastModified: {},
  etag: {},

  ajaxSettings: {
    url: ajaxLocation,
    type: "GET",
    isLocal: rlocalProtocol.test( ajaxLocParts[ 1 ] ),
    global: true,
    processData: true,
    async: true,
    contentType: "application/x-www-form-urlencoded; charset=UTF-8",
timeout: 0, data: null, dataType: null, username: null, password: null, cache: null, throws: false, traditional: false, headers: {}, 
    accepts: {
      "*": allTypes,
      text: "text/plain",
      html: "text/html",
      xml: "application/xml, text/xml",
      json: "application/json, text/javascript"
    },

    contents: {
      xml: /xml/,
      html: /html/,
      json: /json/
    },

    responseFields: {
      xml: "responseXML",
      text: "responseText"
    },

Data converters Keys separate source (or catchall "*") and destination types with a single space

    converters: {

Convert anything to text

      "* text": window.String,

Text to html (true = no transformation)

      "text html": true,

Evaluate text as a json expression

      "text json": jQuery.parseJSON,

Parse text as xml

      "text xml": jQuery.parseXML
    },

For options that shouldn't be deep extended: you can add your own custom options here if and when you create one that shouldn't be deep extended (see ajaxExtend)

    flatOptions: {
      url: true,
      context: true
    }
  },

Creates a full fledged settings object into target with both ajaxSettings and settings fields. If target is omitted, writes into ajaxSettings.

  ajaxSetup: function( target, settings ) {
    return settings ?

Building a settings object

      ajaxExtend( ajaxExtend( target, jQuery.ajaxSettings ), settings ) :

Extending ajaxSettings

      ajaxExtend( jQuery.ajaxSettings, target );
  },

  ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
  ajaxTransport: addToPrefiltersOrTransports( transports ),

Main method

  ajax: function( url, options ) {

If url is an object, simulate pre-1.5 signature

    if ( typeof url === "object" ) {
      options = url;
      url = undefined;
    }

Force options to be an object

    options = options || {};

    var // Cross-domain detection vars
      parts,

Loop variable

      i,

URL without anti-cache param

      cacheURL,

Response headers as string

      responseHeadersString,

timeout handle

      timeoutTimer,

To know if global events are to be dispatched

      fireGlobals,

      transport,

Response headers

      responseHeaders,

Create the final options object

      s = jQuery.ajaxSetup( {}, options ),

Callbacks context

      callbackContext = s.context || s,

Context for global events is callbackContext if it is a DOM node or jQuery collection

      globalEventContext = s.context && ( callbackContext.nodeType || callbackContext.jquery ) ?
        jQuery( callbackContext ) :
        jQuery.event,

Deferreds

      deferred = jQuery.Deferred(),
      completeDeferred = jQuery.Callbacks("once memory"),

Status-dependent callbacks

      statusCode = s.statusCode || {},

Headers (they are sent all at once)

      requestHeaders = {},
      requestHeadersNames = {},

The jqXHR state

      state = 0,

Default abort message

      strAbort = "canceled",

Fake xhr

      jqXHR = {
        readyState: 0,

Builds headers hashtable if needed

        getResponseHeader: function( key ) {
          var match;
          if ( state === 2 ) {
            if ( !responseHeaders ) {
              responseHeaders = {};
              while ( (match = rheaders.exec( responseHeadersString )) ) {
                responseHeaders[ match[1].toLowerCase() ] = match[ 2 ];
              }
            }
            match = responseHeaders[ key.toLowerCase() ];
          }
          return match == null ? null : match;
        },

Raw string

        getAllResponseHeaders: function() {
          return state === 2 ? responseHeadersString : null;
        },

Caches the header

        setRequestHeader: function( name, value ) {
          var lname = name.toLowerCase();
          if ( !state ) {
            name = requestHeadersNames[ lname ] = requestHeadersNames[ lname ] || name;
            requestHeaders[ name ] = value;
          }
          return this;
        },

Overrides response content-type header

        overrideMimeType: function( type ) {
          if ( !state ) {
            s.mimeType = type;
          }
          return this;
        },

Status-dependent callbacks

        statusCode: function( map ) {
          var code;
          if ( map ) {
            if ( state < 2 ) {
              for ( code in map ) {

Lazy-add the new callback in a way that preserves old ones

                statusCode[ code ] = [ statusCode[ code ], map[ code ] ];
              }
            } else {

Execute the appropriate callbacks

              jqXHR.always( map[ jqXHR.status ] );
            }
          }
          return this;
        },

Cancel the request

        abort: function( statusText ) {
          var finalText = statusText || strAbort;
          if ( transport ) {
            transport.abort( finalText );
          }
          done( 0, finalText );
          return this;
        }
      };

Attach deferreds

    deferred.promise( jqXHR ).complete = completeDeferred.add;
    jqXHR.success = jqXHR.done;
    jqXHR.error = jqXHR.fail;

Remove hash character (#7531: and string promotion) Add protocol if not provided (#5866: IE7 issue with protocol-less urls) Handle falsy url in the settings object (#10093: consistency with old signature) We also use the url parameter if available

    s.url = ( ( url || s.url || ajaxLocation ) + "" ).replace( rhash, "" ).replace( rprotocol, ajaxLocParts[ 1 ] + "//" );

Alias method option to type as per ticket #12004

    s.type = options.method || options.type || s.method || s.type;

Extract dataTypes list

    s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().match( core_rnotwhite ) || [""];

A cross-domain request is in order when we have a protocol:host:port mismatch

    if ( s.crossDomain == null ) {
      parts = rurl.exec( s.url.toLowerCase() );
      s.crossDomain = !!( parts &&
        ( parts[ 1 ] !== ajaxLocParts[ 1 ] || parts[ 2 ] !== ajaxLocParts[ 2 ] ||
          ( parts[ 3 ] || ( parts[ 1 ] === "http:" ? 80 : 443 ) ) !=
            ( ajaxLocParts[ 3 ] || ( ajaxLocParts[ 1 ] === "http:" ? 80 : 443 ) ) )
      );
    }

Convert data if not already a string

    if ( s.data && s.processData && typeof s.data !== "string" ) {
      s.data = jQuery.param( s.data, s.traditional );
    }

Apply prefilters

    inspectPrefiltersOrTransports( prefilters, s, options, jqXHR );

If request was aborted inside a prefilter, stop there

    if ( state === 2 ) {
      return jqXHR;
    }

We can fire global events as of now if asked to

    fireGlobals = s.global;

Watch for a new set of requests

    if ( fireGlobals && jQuery.active++ === 0 ) {
      jQuery.event.trigger("ajaxStart");
    }

Uppercase the type

    s.type = s.type.toUpperCase();

Determine if request has content

    s.hasContent = !rnoContent.test( s.type );

Save the URL in case we're toying with the If-Modified-Since and/or If-None-Match header later on

    cacheURL = s.url;

More options handling for requests with no content

    if ( !s.hasContent ) {

If data is available, append data to url

      if ( s.data ) {
        cacheURL = ( s.url += ( ajax_rquery.test( cacheURL ) ? "&" : "?" ) + s.data );

#9682: remove data so that it's not used in an eventual retry

        delete s.data;
      }

Add anti-cache in url if needed

      if ( s.cache === false ) {
        s.url = rts.test( cacheURL ) ?

If there is already a '_' parameter, set its value

          cacheURL.replace( rts, "$1_=" + ajax_nonce++ ) :

Otherwise add one to the end

          cacheURL + ( ajax_rquery.test( cacheURL ) ? "&" : "?" ) + "_=" + ajax_nonce++;
      }
    }

Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.

    if ( s.ifModified ) {
      if ( jQuery.lastModified[ cacheURL ] ) {
        jqXHR.setRequestHeader( "If-Modified-Since", jQuery.lastModified[ cacheURL ] );
      }
      if ( jQuery.etag[ cacheURL ] ) {
        jqXHR.setRequestHeader( "If-None-Match", jQuery.etag[ cacheURL ] );
      }
    }

Set the correct header, if data is being sent

    if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
      jqXHR.setRequestHeader( "Content-Type", s.contentType );
    }

Set the Accepts header for the server, depending on the dataType

    jqXHR.setRequestHeader(
      "Accept",
      s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
        s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", " + allTypes + "; q=0.01" : "" ) :
        s.accepts[ "*" ]
    );

Check for headers option

    for ( i in s.headers ) {
      jqXHR.setRequestHeader( i, s.headers[ i ] );
    }

Allow custom headers/mimetypes and early abort

    if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jqXHR, s ) === false || state === 2 ) ) {

Abort if not done already and return

      return jqXHR.abort();
    }

aborting is no longer a cancellation

    strAbort = "abort";

Install callbacks on deferreds

    for ( i in { success: 1, error: 1, complete: 1 } ) {
      jqXHR[ i ]( s[ i ] );
    }

Get transport

    transport = inspectPrefiltersOrTransports( transports, s, options, jqXHR );

If no transport, we auto-abort

    if ( !transport ) {
      done( -1, "No Transport" );
    } else {
      jqXHR.readyState = 1;

Send global event

      if ( fireGlobals ) {
        globalEventContext.trigger( "ajaxSend", [ jqXHR, s ] );
      }

Timeout

      if ( s.async && s.timeout > 0 ) {
        timeoutTimer = setTimeout(function() {
          jqXHR.abort("timeout");
        }, s.timeout );
      }

      try {
        state = 1;
        transport.send( requestHeaders, done );
      } catch ( e ) {

Propagate exception as error if not done

        if ( state < 2 ) {
          done( -1, e );

Simply rethrow otherwise

        } else {
          throw e;
        }
      }
    }

Callback for when everything is done

    function done( status, nativeStatusText, responses, headers ) {
      var isSuccess, success, error, response, modified,
        statusText = nativeStatusText;

Called once

      if ( state === 2 ) {
        return;
      }

State is "done" now

      state = 2;

Clear timeout if it exists

      if ( timeoutTimer ) {
        clearTimeout( timeoutTimer );
      }

Dereference transport for early garbage collection (no matter how long the jqXHR object will be used)

      transport = undefined;

Cache response headers

      responseHeadersString = headers || "";

Set readyState

      jqXHR.readyState = status > 0 ? 4 : 0;

Get response data

      if ( responses ) {
        response = ajaxHandleResponses( s, jqXHR, responses );
      }

If successful, handle type chaining

      if ( status >= 200 && status < 300 || status === 304 ) {

Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.

        if ( s.ifModified ) {
          modified = jqXHR.getResponseHeader("Last-Modified");
          if ( modified ) {
            jQuery.lastModified[ cacheURL ] = modified;
          }
          modified = jqXHR.getResponseHeader("etag");
          if ( modified ) {
            jQuery.etag[ cacheURL ] = modified;
          }
        }

if no content

        if ( status === 204 ) {
          isSuccess = true;
          statusText = "nocontent";

if not modified

        } else if ( status === 304 ) {
          isSuccess = true;
          statusText = "notmodified";

If we have data, let's convert it

        } else {
          isSuccess = ajaxConvert( s, response );
          statusText = isSuccess.state;
          success = isSuccess.data;
          error = isSuccess.error;
          isSuccess = !error;
        }
      } else {

We extract error from statusText then normalize statusText and status for non-aborts

        error = statusText;
        if ( status || !statusText ) {
          statusText = "error";
          if ( status < 0 ) {
            status = 0;
          }
        }
      }

Set data for the fake xhr object

      jqXHR.status = status;
      jqXHR.statusText = ( nativeStatusText || statusText ) + "";

Success/Error

      if ( isSuccess ) {
        deferred.resolveWith( callbackContext, [ success, statusText, jqXHR ] );
      } else {
        deferred.rejectWith( callbackContext, [ jqXHR, statusText, error ] );
      }

Status-dependent callbacks

      jqXHR.statusCode( statusCode );
      statusCode = undefined;

      if ( fireGlobals ) {
        globalEventContext.trigger( isSuccess ? "ajaxSuccess" : "ajaxError",
          [ jqXHR, s, isSuccess ? success : error ] );
      }

Complete

      completeDeferred.fireWith( callbackContext, [ jqXHR, statusText ] );

      if ( fireGlobals ) {
        globalEventContext.trigger( "ajaxComplete", [ jqXHR, s ] );

Handle the global AJAX counter

        if ( !( --jQuery.active ) ) {
          jQuery.event.trigger("ajaxStop");
        }
      }
    }

    return jqXHR;
  },

  getScript: function( url, callback ) {
    return jQuery.get( url, undefined, callback, "script" );
  },

  getJSON: function( url, data, callback ) {
    return jQuery.get( url, data, callback, "json" );
  }
});

Handles responses to an ajax request: - sets all responseXXX fields accordingly - finds the right dataType (mediates between content-type and expected dataType) - returns the corresponding response

function ajaxHandleResponses( s, jqXHR, responses ) {
  var firstDataType, ct, finalDataType, type,
    contents = s.contents,
    dataTypes = s.dataTypes,
    responseFields = s.responseFields;

Fill responseXXX fields

  for ( type in responseFields ) {
    if ( type in responses ) {
      jqXHR[ responseFields[type] ] = responses[ type ];
    }
  }

Remove auto dataType and get content-type in the process

  while( dataTypes[ 0 ] === "*" ) {
    dataTypes.shift();
    if ( ct === undefined ) {
      ct = s.mimeType || jqXHR.getResponseHeader("Content-Type");
    }
  }

Check if we're dealing with a known content-type

  if ( ct ) {
    for ( type in contents ) {
      if ( contents[ type ] && contents[ type ].test( ct ) ) {
        dataTypes.unshift( type );
        break;
      }
    }
  }

Check to see if we have a response for the expected dataType

  if ( dataTypes[ 0 ] in responses ) {
    finalDataType = dataTypes[ 0 ];
  } else {

Try convertible dataTypes

    for ( type in responses ) {
      if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
        finalDataType = type;
        break;
      }
      if ( !firstDataType ) {
        firstDataType = type;
      }
    }

Or just use first one

    finalDataType = finalDataType || firstDataType;
  }

If we found a dataType We add the dataType to the list if needed and return the corresponding response

  if ( finalDataType ) {
    if ( finalDataType !== dataTypes[ 0 ] ) {
      dataTypes.unshift( finalDataType );
    }
    return responses[ finalDataType ];
  }
}

Chain conversions given the request and the original response

function ajaxConvert( s, response ) {
  var conv2, current, conv, tmp,
    converters = {},
    i = 0,

Work with a copy of dataTypes in case we need to modify it for conversion

    dataTypes = s.dataTypes.slice(),
    prev = dataTypes[ 0 ];

Apply the dataFilter if provided

  if ( s.dataFilter ) {
    response = s.dataFilter( response, s.dataType );
  }

Create converters map with lowercased keys

  if ( dataTypes[ 1 ] ) {
    for ( conv in s.converters ) {
      converters[ conv.toLowerCase() ] = s.converters[ conv ];
    }
  }

Convert to each sequential dataType, tolerating list modification

  for ( ; (current = dataTypes[++i]); ) {

There's only work to do if current dataType is non-auto

    if ( current !== "*" ) {

Convert response if prev dataType is non-auto and differs from current

      if ( prev !== "*" && prev !== current ) {

Seek a direct converter

        conv = converters[ prev + " " + current ] || converters[ "* " + current ];

If none found, seek a pair

        if ( !conv ) {
          for ( conv2 in converters ) {

If conv2 outputs current

            tmp = conv2.split(" ");
            if ( tmp[ 1 ] === current ) {

If prev can be converted to accepted input

              conv = converters[ prev + " " + tmp[ 0 ] ] ||
                converters[ "* " + tmp[ 0 ] ];
              if ( conv ) {

Condense equivalence converters

                if ( conv === true ) {
                  conv = converters[ conv2 ];

Otherwise, insert the intermediate dataType

                } else if ( converters[ conv2 ] !== true ) {
                  current = tmp[ 0 ];
                  dataTypes.splice( i--, 0, current );
                }

                break;
              }
            }
          }
        }

Apply converter (if not an equivalence)

        if ( conv !== true ) {

Unless errors are allowed to bubble, catch and return them

          if ( conv && s["throws"] ) {
            response = conv( response );
          } else {
            try {
              response = conv( response );
            } catch ( e ) {
              return { state: "parsererror", error: conv ? e : "No conversion from " + prev + " to " + current };
            }
          }
        }
      }

Update prev for next iteration

      prev = current;
    }
  }

  return { state: "success", data: response };
}

Install script dataType

jQuery.ajaxSetup({
  accepts: {
    script: "text/javascript, application/javascript, application/ecmascript, application/x-ecmascript"
  },
  contents: {
    script: /(?:java|ecma)script/
  },
  converters: {
    "text script": function( text ) {
      jQuery.globalEval( text );
      return text;
    }
  }
});

Handle cache's special case and global

jQuery.ajaxPrefilter( "script", function( s ) {
  if ( s.cache === undefined ) {
    s.cache = false;
  }
  if ( s.crossDomain ) {
    s.type = "GET";
    s.global = false;
  }
});

Bind script tag hack transport

jQuery.ajaxTransport( "script", function(s) {

This transport only deals with cross domain requests

  if ( s.crossDomain ) {

    var script,
      head = document.head || jQuery("head")[0] || document.documentElement;

    return {

      send: function( _, callback ) {

        script = document.createElement("script");

        script.async = true;

        if ( s.scriptCharset ) {
          script.charset = s.scriptCharset;
        }

        script.src = s.url;

Attach handlers for all browsers

        script.onload = script.onreadystatechange = function( _, isAbort ) {

          if ( isAbort || !script.readyState || /loaded|complete/.test( script.readyState ) ) {

Handle memory leak in IE

            script.onload = script.onreadystatechange = null;

Remove the script

            if ( script.parentNode ) {
              script.parentNode.removeChild( script );
            }

Dereference the script

            script = null;

Callback if not abort

            if ( !isAbort ) {
              callback( 200, "success" );
            }
          }
        };

Circumvent IE6 bugs with base elements (#2709 and #4378) by prepending Use native DOM manipulation to avoid our domManip AJAX trickery

        head.insertBefore( script, head.firstChild );
      },

      abort: function() {
        if ( script ) {
          script.onload( undefined, true );
        }
      }
    };
  }
});
var oldCallbacks = [],
  rjsonp = /(=)\?(?=&|$)|\?\?/;

Default jsonp settings

jQuery.ajaxSetup({
  jsonp: "callback",
  jsonpCallback: function() {
    var callback = oldCallbacks.pop() || ( jQuery.expando + "_" + ( ajax_nonce++ ) );
    this[ callback ] = true;
    return callback;
  }
});

Detect, normalize options and install callbacks for jsonp requests

jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, jqXHR ) {

  var callbackName, overwritten, responseContainer,
    jsonProp = s.jsonp !== false && ( rjsonp.test( s.url ) ?
      "url" :
      typeof s.data === "string" && !( s.contentType || "" ).indexOf("application/x-www-form-urlencoded") && rjsonp.test( s.data ) && "data"
    );

Handle iff the expected data type is "jsonp" or we have a parameter to set

  if ( jsonProp || s.dataTypes[ 0 ] === "jsonp" ) {

Get callback name, remembering preexisting value associated with it

    callbackName = s.jsonpCallback = jQuery.isFunction( s.jsonpCallback ) ?
      s.jsonpCallback() :
      s.jsonpCallback;

Insert callback into url or form data

    if ( jsonProp ) {
      s[ jsonProp ] = s[ jsonProp ].replace( rjsonp, "$1" + callbackName );
    } else if ( s.jsonp !== false ) {
      s.url += ( ajax_rquery.test( s.url ) ? "&" : "?" ) + s.jsonp + "=" + callbackName;
    }

Use data converter to retrieve json after script execution

    s.converters["script json"] = function() {
      if ( !responseContainer ) {
        jQuery.error( callbackName + " was not called" );
      }
      return responseContainer[ 0 ];
    };

force json dataType

    s.dataTypes[ 0 ] = "json";

Install callback

    overwritten = window[ callbackName ];
    window[ callbackName ] = function() {
      responseContainer = arguments;
    };

Clean-up function (fires after converters)

    jqXHR.always(function() {

Restore preexisting value

      window[ callbackName ] = overwritten;

Save back as free

      if ( s[ callbackName ] ) {

make sure that re-using the options doesn't screw things around

        s.jsonpCallback = originalSettings.jsonpCallback;

save the callback name for future use

        oldCallbacks.push( callbackName );
      }

Call if it was a function and we have a response

      if ( responseContainer && jQuery.isFunction( overwritten ) ) {
        overwritten( responseContainer[ 0 ] );
      }

      responseContainer = overwritten = undefined;
    });

Delegate to script

    return "script";
  }
});
var xhrCallbacks, xhrSupported,
  xhrId = 0,

#5280: Internet Explorer will keep connections alive if we don't abort on unload

  xhrOnUnloadAbort = window.ActiveXObject && function() {

Abort all pending requests

    var key;
    for ( key in xhrCallbacks ) {
      xhrCallbacks[ key ]( undefined, true );
    }
  };

Functions to create xhrs

function createStandardXHR() {
  try {
    return new window.XMLHttpRequest();
  } catch( e ) {}
}

function createActiveXHR() {
  try {
    return new window.ActiveXObject("Microsoft.XMLHTTP");
  } catch( e ) {}
}

Create the request object (This is still attached to ajaxSettings for backward compatibility)

jQuery.ajaxSettings.xhr = window.ActiveXObject ?

Microsoft failed to properly implement the XMLHttpRequest in IE7 (can't request local files), so we use the ActiveXObject when it is available Additionally XMLHttpRequest can be disabled in IE7/IE8 so we need a fallback.

  function() {
    return !this.isLocal && createStandardXHR() || createActiveXHR();
  } :

For all other browsers, use the standard XMLHttpRequest object

  createStandardXHR;

Determine support properties

xhrSupported = jQuery.ajaxSettings.xhr();
jQuery.support.cors = !!xhrSupported && ( "withCredentials" in xhrSupported );
xhrSupported = jQuery.support.ajax = !!xhrSupported;

Create transport if the browser can provide an xhr

if ( xhrSupported ) {

  jQuery.ajaxTransport(function( s ) {

Cross domain only allowed if supported through XMLHttpRequest

    if ( !s.crossDomain || jQuery.support.cors ) {

      var callback;

      return {
        send: function( headers, complete ) {

Get a new xhr

          var handle, i,
            xhr = s.xhr();

Open the socket Passing null username, generates a login popup on Opera (#2865)

          if ( s.username ) {
            xhr.open( s.type, s.url, s.async, s.username, s.password );
          } else {
            xhr.open( s.type, s.url, s.async );
          }

Apply custom fields if provided

          if ( s.xhrFields ) {
            for ( i in s.xhrFields ) {
              xhr[ i ] = s.xhrFields[ i ];
            }
          }

Override mime type if needed

          if ( s.mimeType && xhr.overrideMimeType ) {
            xhr.overrideMimeType( s.mimeType );
          }

X-Requested-With header For cross-domain requests, seeing as conditions for a preflight are akin to a jigsaw puzzle, we simply never set it to be sure. (it can always be set on a per-request basis or even using ajaxSetup) For same-domain requests, won't change header if already provided.

          if ( !s.crossDomain && !headers["X-Requested-With"] ) {
            headers["X-Requested-With"] = "XMLHttpRequest";
          }

Need an extra try/catch for cross domain requests in Firefox 3

          try {
            for ( i in headers ) {
              xhr.setRequestHeader( i, headers[ i ] );
            }
          } catch( err ) {}

Do send the request This may raise an exception which is actually handled in jQuery.ajax (so no try/catch here)

          xhr.send( ( s.hasContent && s.data ) || null );

Listener

          callback = function( _, isAbort ) {
            var status, responseHeaders, statusText, responses;

Firefox throws exceptions when accessing properties of an xhr when a network error occurred http://helpful.knobs-dials.com/index.php/Componentreturnedfailurecode:0x80040111(NSERRORNOTAVAILABLE)

            try {

Was never called and is aborted or complete

              if ( callback && ( isAbort || xhr.readyState === 4 ) ) {

Only called once

                callback = undefined;

Do not keep as active anymore

                if ( handle ) {
                  xhr.onreadystatechange = jQuery.noop;
                  if ( xhrOnUnloadAbort ) {
                    delete xhrCallbacks[ handle ];
                  }
                }

If it's an abort

                if ( isAbort ) {

Abort it manually if needed

                  if ( xhr.readyState !== 4 ) {
                    xhr.abort();
                  }
                } else {
                  responses = {};
                  status = xhr.status;
                  responseHeaders = xhr.getAllResponseHeaders();

When requesting binary data, IE6-9 will throw an exception on any attempt to access responseText (#11426)

                  if ( typeof xhr.responseText === "string" ) {
                    responses.text = xhr.responseText;
                  }

Firefox throws an exception when accessing statusText for faulty cross-domain requests

                  try {
                    statusText = xhr.statusText;
                  } catch( e ) {

We normalize with Webkit giving an empty statusText

                    statusText = "";
                  }

Filter status for non standard behaviors

If the request is local and we have data: assume a success (success with no data won't get notified, that's the best we can do given current implementations)

                  if ( !status && s.isLocal && !s.crossDomain ) {
                    status = responses.text ? 200 : 404;

IE - #1450: sometimes returns 1223 when it should be 204

                  } else if ( status === 1223 ) {
                    status = 204;
                  }
                }
              }
            } catch( firefoxAccessException ) {
              if ( !isAbort ) {
                complete( -1, firefoxAccessException );
              }
            }

Call complete if needed

            if ( responses ) {
              complete( status, statusText, responses, responseHeaders );
            }
          };

          if ( !s.async ) {

if we're in sync mode we fire the callback

            callback();
          } else if ( xhr.readyState === 4 ) {

(IE6 & IE7) if it's in cache and has been retrieved directly we need to fire the callback

            setTimeout( callback );
          } else {
            handle = ++xhrId;
            if ( xhrOnUnloadAbort ) {

Create the active xhrs callbacks list if needed and attach the unload handler

              if ( !xhrCallbacks ) {
                xhrCallbacks = {};
                jQuery( window ).unload( xhrOnUnloadAbort );
              }

Add to list of active xhrs callbacks

              xhrCallbacks[ handle ] = callback;
            }
            xhr.onreadystatechange = callback;
          }
        },

        abort: function() {
          if ( callback ) {
            callback( undefined, true );
          }
        }
      };
    }
  });
}
var fxNow, timerId,
  rfxtypes = /^(?:toggle|show|hide)$/,
  rfxnum = new RegExp( "^(?:([+-])=|)(" + core_pnum + ")([a-z%]*)$", "i" ),
  rrun = /queueHooks$/,
  animationPrefilters = [ defaultPrefilter ],
  tweeners = {
    "*": [function( prop, value ) {
      var end, unit,
        tween = this.createTween( prop, value ),
        parts = rfxnum.exec( value ),
        target = tween.cur(),
        start = +target || 0,
        scale = 1,
        maxIterations = 20;

      if ( parts ) {
        end = +parts[2];
        unit = parts[3] || ( jQuery.cssNumber[ prop ] ? "" : "px" );

We need to compute starting value

        if ( unit !== "px" && start ) {

Iteratively approximate from a nonzero starting point Prefer the current property, because this process will be trivial if it uses the same units Fallback to end or a simple constant

          start = jQuery.css( tween.elem, prop, true ) || end || 1;

          do {

If previous iteration zeroed out, double until we get something Use a string for doubling factor so we don't accidentally see scale as unchanged below

            scale = scale || ".5";

Adjust and apply

            start = start / scale;
            jQuery.style( tween.elem, prop, start + unit );

Update scale, tolerating zero or NaN from tween.cur() And breaking the loop if scale is unchanged or perfect, or if we've just had enough

          } while ( scale !== (scale = tween.cur() / target) && scale !== 1 && --maxIterations );
        }

        tween.unit = unit;
        tween.start = start;

If a +=/-= token was provided, we're doing a relative animation

        tween.end = parts[1] ? start + ( parts[1] + 1 ) * end : end;
      }
      return tween;
    }]
  };

Animations created synchronously will run synchronously

function createFxNow() {
  setTimeout(function() {
    fxNow = undefined;
  });
  return ( fxNow = jQuery.now() );
}

function createTweens( animation, props ) {
  jQuery.each( props, function( prop, value ) {
    var collection = ( tweeners[ prop ] || [] ).concat( tweeners[ "*" ] ),
      index = 0,
      length = collection.length;
    for ( ; index < length; index++ ) {
      if ( collection[ index ].call( animation, prop, value ) ) {

we're done with this property

        return;
      }
    }
  });
}

function Animation( elem, properties, options ) {
  var result,
    stopped,
    index = 0,
    length = animationPrefilters.length,
    deferred = jQuery.Deferred().always( function() {

don't match elem in the :animated selector

      delete tick.elem;
    }),
    tick = function() {
      if ( stopped ) {
        return false;
      }
      var currentTime = fxNow || createFxNow(),
        remaining = Math.max( 0, animation.startTime + animation.duration - currentTime ),

archaic crash bug won't allow us to use 1 - ( 0.5 || 0 ) (#12497)

        temp = remaining / animation.duration || 0,
        percent = 1 - temp,
        index = 0,
        length = animation.tweens.length;

      for ( ; index < length ; index++ ) {
        animation.tweens[ index ].run( percent );
      }

      deferred.notifyWith( elem, [ animation, percent, remaining ]);

      if ( percent < 1 && length ) {
        return remaining;
      } else {
        deferred.resolveWith( elem, [ animation ] );
        return false;
      }
    },
    animation = deferred.promise({
      elem: elem,
      props: jQuery.extend( {}, properties ),
      opts: jQuery.extend( true, { specialEasing: {} }, options ),
      originalProperties: properties,
      originalOptions: options,
      startTime: fxNow || createFxNow(),
      duration: options.duration,
      tweens: [],
      createTween: function( prop, end ) {
        var tween = jQuery.Tween( elem, animation.opts, prop, end,
            animation.opts.specialEasing[ prop ] || animation.opts.easing );
        animation.tweens.push( tween );
        return tween;
      },
      stop: function( gotoEnd ) {
        var index = 0,

if we are going to the end, we want to run all the tweens otherwise we skip this part

          length = gotoEnd ? animation.tweens.length : 0;
        if ( stopped ) {
          return this;
        }
        stopped = true;
        for ( ; index < length ; index++ ) {
          animation.tweens[ index ].run( 1 );
        }

resolve when we played the last frame otherwise, reject

        if ( gotoEnd ) {
          deferred.resolveWith( elem, [ animation, gotoEnd ] );
        } else {
          deferred.rejectWith( elem, [ animation, gotoEnd ] );
        }
        return this;
      }
    }),
    props = animation.props;

  propFilter( props, animation.opts.specialEasing );

  for ( ; index < length ; index++ ) {
    result = animationPrefilters[ index ].call( animation, elem, props, animation.opts );
    if ( result ) {
      return result;
    }
  }

  createTweens( animation, props );

  if ( jQuery.isFunction( animation.opts.start ) ) {
    animation.opts.start.call( elem, animation );
  }

  jQuery.fx.timer(
    jQuery.extend( tick, {
      elem: elem,
      anim: animation,
      queue: animation.opts.queue
    })
  );

attach callbacks from options

  return animation.progress( animation.opts.progress )
    .done( animation.opts.done, animation.opts.complete )
    .fail( animation.opts.fail )
    .always( animation.opts.always );
}

function propFilter( props, specialEasing ) {
  var value, name, index, easing, hooks;

camelCase, specialEasing and expand cssHook pass

  for ( index in props ) {
    name = jQuery.camelCase( index );
    easing = specialEasing[ name ];
    value = props[ index ];
    if ( jQuery.isArray( value ) ) {
      easing = value[ 1 ];
      value = props[ index ] = value[ 0 ];
    }

    if ( index !== name ) {
      props[ name ] = value;
      delete props[ index ];
    }

    hooks = jQuery.cssHooks[ name ];
    if ( hooks && "expand" in hooks ) {
      value = hooks.expand( value );
      delete props[ name ];

not quite $.extend, this wont overwrite keys already present. also - reusing 'index' from above because we have the correct "name"

      for ( index in value ) {
        if ( !( index in props ) ) {
          props[ index ] = value[ index ];
          specialEasing[ index ] = easing;
        }
      }
    } else {
      specialEasing[ name ] = easing;
    }
  }
}

jQuery.Animation = jQuery.extend( Animation, {

  tweener: function( props, callback ) {
    if ( jQuery.isFunction( props ) ) {
      callback = props;
      props = [ "*" ];
    } else {
      props = props.split(" ");
    }

    var prop,
      index = 0,
      length = props.length;

    for ( ; index < length ; index++ ) {
      prop = props[ index ];
      tweeners[ prop ] = tweeners[ prop ] || [];
      tweeners[ prop ].unshift( callback );
    }
  },

  prefilter: function( callback, prepend ) {
    if ( prepend ) {
      animationPrefilters.unshift( callback );
    } else {
      animationPrefilters.push( callback );
    }
  }
});

function defaultPrefilter( elem, props, opts ) {

jshint validthis:true

  var prop, index, length,
    value, dataShow, toggle,
    tween, hooks, oldfire,
    anim = this,
    style = elem.style,
    orig = {},
    handled = [],
    hidden = elem.nodeType && isHidden( elem );

handle queue: false promises

  if ( !opts.queue ) {
    hooks = jQuery._queueHooks( elem, "fx" );
    if ( hooks.unqueued == null ) {
      hooks.unqueued = 0;
      oldfire = hooks.empty.fire;
      hooks.empty.fire = function() {
        if ( !hooks.unqueued ) {
          oldfire();
        }
      };
    }
    hooks.unqueued++;

    anim.always(function() {

doing this makes sure that the complete handler will be called before this completes

      anim.always(function() {
        hooks.unqueued--;
        if ( !jQuery.queue( elem, "fx" ).length ) {
          hooks.empty.fire();
        }
      });
    });
  }

height/width overflow pass

  if ( elem.nodeType === 1 && ( "height" in props || "width" in props ) ) {

Make sure that nothing sneaks out Record all 3 overflow attributes because IE does not change the overflow attribute when overflowX and overflowY are set to the same value

    opts.overflow = [ style.overflow, style.overflowX, style.overflowY ];

Set display property to inline-block for height/width animations on inline elements that are having width/height animated

    if ( jQuery.css( elem, "display" ) === "inline" &&
        jQuery.css( elem, "float" ) === "none" ) {

inline-level elements accept inline-block; block-level elements need to be inline with layout

      if ( !jQuery.support.inlineBlockNeedsLayout || css_defaultDisplay( elem.nodeName ) === "inline" ) {
        style.display = "inline-block";

      } else {
        style.zoom = 1;
      }
    }
  }

  if ( opts.overflow ) {
    style.overflow = "hidden";
    if ( !jQuery.support.shrinkWrapBlocks ) {
      anim.always(function() {
        style.overflow = opts.overflow[ 0 ];
        style.overflowX = opts.overflow[ 1 ];
        style.overflowY = opts.overflow[ 2 ];
      });
    }
  }

show/hide pass

  for ( index in props ) {
    value = props[ index ];
    if ( rfxtypes.exec( value ) ) {
      delete props[ index ];
      toggle = toggle || value === "toggle";
      if ( value === ( hidden ? "hide" : "show" ) ) {
        continue;
      }
      handled.push( index );
    }
  }

  length = handled.length;
  if ( length ) {
    dataShow = jQuery._data( elem, "fxshow" ) || jQuery._data( elem, "fxshow", {} );
    if ( "hidden" in dataShow ) {
      hidden = dataShow.hidden;
    }

store state if its toggle - enables .stop().toggle() to "reverse"

    if ( toggle ) {
      dataShow.hidden = !hidden;
    }
    if ( hidden ) {
      jQuery( elem ).show();
    } else {
      anim.done(function() {
        jQuery( elem ).hide();
      });
    }
    anim.done(function() {
      var prop;
      jQuery._removeData( elem, "fxshow" );
      for ( prop in orig ) {
        jQuery.style( elem, prop, orig[ prop ] );
      }
    });
    for ( index = 0 ; index < length ; index++ ) {
      prop = handled[ index ];
      tween = anim.createTween( prop, hidden ? dataShow[ prop ] : 0 );
      orig[ prop ] = dataShow[ prop ] || jQuery.style( elem, prop );

      if ( !( prop in dataShow ) ) {
        dataShow[ prop ] = tween.start;
        if ( hidden ) {
          tween.end = tween.start;
          tween.start = prop === "width" || prop === "height" ? 1 : 0;
        }
      }
    }
  }
}

function Tween( elem, options, prop, end, easing ) {
  return new Tween.prototype.init( elem, options, prop, end, easing );
}
jQuery.Tween = Tween;

Tween.prototype = {
  constructor: Tween,
  init: function( elem, options, prop, end, easing, unit ) {
    this.elem = elem;
    this.prop = prop;
    this.easing = easing || "swing";
    this.options = options;
    this.start = this.now = this.cur();
    this.end = end;
    this.unit = unit || ( jQuery.cssNumber[ prop ] ? "" : "px" );
  },
  cur: function() {
    var hooks = Tween.propHooks[ this.prop ];

    return hooks && hooks.get ?
      hooks.get( this ) :
      Tween.propHooks._default.get( this );
  },
  run: function( percent ) {
    var eased,
      hooks = Tween.propHooks[ this.prop ];

    if ( this.options.duration ) {
      this.pos = eased = jQuery.easing[ this.easing ](
        percent, this.options.duration * percent, 0, 1, this.options.duration
      );
    } else {
      this.pos = eased = percent;
    }
    this.now = ( this.end - this.start ) * eased + this.start;

    if ( this.options.step ) {
      this.options.step.call( this.elem, this.now, this );
    }

    if ( hooks && hooks.set ) {
      hooks.set( this );
    } else {
      Tween.propHooks._default.set( this );
    }
    return this;
  }
};

Tween.prototype.init.prototype = Tween.prototype;

Tween.propHooks = {
  _default: {
    get: function( tween ) {
      var result;

      if ( tween.elem[ tween.prop ] != null &&
        (!tween.elem.style || tween.elem.style[ tween.prop ] == null) ) {
        return tween.elem[ tween.prop ];
      }

passing an empty string as a 3rd parameter to .css will automatically attempt a parseFloat and fallback to a string if the parse fails so, simple values such as "10px" are parsed to Float. complex values such as "rotate(1rad)" are returned as is.

      result = jQuery.css( tween.elem, tween.prop, "" );

Empty strings, null, undefined and "auto" are converted to 0.

      return !result || result === "auto" ? 0 : result;
    },
    set: function( tween ) {

use step hook for back compat - use cssHook if its there - use .style if its available and use plain properties where available

      if ( jQuery.fx.step[ tween.prop ] ) {
        jQuery.fx.step[ tween.prop ]( tween );
      } else if ( tween.elem.style && ( tween.elem.style[ jQuery.cssProps[ tween.prop ] ] != null || jQuery.cssHooks[ tween.prop ] ) ) {
        jQuery.style( tween.elem, tween.prop, tween.now + tween.unit );
      } else {
        tween.elem[ tween.prop ] = tween.now;
      }
    }
  }
};

Remove in 2.0 - this supports IE8's panic based approach to setting things on disconnected nodes

Tween.propHooks.scrollTop = Tween.propHooks.scrollLeft = {
  set: function( tween ) {
    if ( tween.elem.nodeType && tween.elem.parentNode ) {
      tween.elem[ tween.prop ] = tween.now;
    }
  }
};

jQuery.each([ "toggle", "show", "hide" ], function( i, name ) {
  var cssFn = jQuery.fn[ name ];
  jQuery.fn[ name ] = function( speed, easing, callback ) {
    return speed == null || typeof speed === "boolean" ?
      cssFn.apply( this, arguments ) :
      this.animate( genFx( name, true ), speed, easing, callback );
  };
});

jQuery.fn.extend({
  fadeTo: function( speed, to, easing, callback ) {

show any hidden elements after setting opacity to 0

    return this.filter( isHidden ).css( "opacity", 0 ).show()

animate to the value specified

      .end().animate({ opacity: to }, speed, easing, callback );
  },
  animate: function( prop, speed, easing, callback ) {
    var empty = jQuery.isEmptyObject( prop ),
      optall = jQuery.speed( speed, easing, callback ),
      doAnimation = function() {

Operate on a copy of prop so per-property easing won't be lost

        var anim = Animation( this, jQuery.extend( {}, prop ), optall );
        doAnimation.finish = function() {
          anim.stop( true );
        };

Empty animations, or finishing resolves immediately

        if ( empty || jQuery._data( this, "finish" ) ) {
          anim.stop( true );
        }
      };
      doAnimation.finish = doAnimation;

    return empty || optall.queue === false ?
      this.each( doAnimation ) :
      this.queue( optall.queue, doAnimation );
  },
  stop: function( type, clearQueue, gotoEnd ) {
    var stopQueue = function( hooks ) {
      var stop = hooks.stop;
      delete hooks.stop;
      stop( gotoEnd );
    };

    if ( typeof type !== "string" ) {
      gotoEnd = clearQueue;
      clearQueue = type;
      type = undefined;
    }
    if ( clearQueue && type !== false ) {
      this.queue( type || "fx", [] );
    }

    return this.each(function() {
      var dequeue = true,
        index = type != null && type + "queueHooks",
        timers = jQuery.timers,
        data = jQuery._data( this );

      if ( index ) {
        if ( data[ index ] && data[ index ].stop ) {
          stopQueue( data[ index ] );
        }
      } else {
        for ( index in data ) {
          if ( data[ index ] && data[ index ].stop && rrun.test( index ) ) {
            stopQueue( data[ index ] );
          }
        }
      }

      for ( index = timers.length; index--; ) {
        if ( timers[ index ].elem === this && (type == null || timers[ index ].queue === type) ) {
          timers[ index ].anim.stop( gotoEnd );
          dequeue = false;
          timers.splice( index, 1 );
        }
      }

start the next in the queue if the last step wasn't forced timers currently will call their complete callbacks, which will dequeue but only if they were gotoEnd

      if ( dequeue || !gotoEnd ) {
        jQuery.dequeue( this, type );
      }
    });
  },
  finish: function( type ) {
    if ( type !== false ) {
      type = type || "fx";
    }
    return this.each(function() {
      var index,
        data = jQuery._data( this ),
        queue = data[ type + "queue" ],
        hooks = data[ type + "queueHooks" ],
        timers = jQuery.timers,
        length = queue ? queue.length : 0;

enable finishing flag on private data

      data.finish = true;

empty the queue first

      jQuery.queue( this, type, [] );

      if ( hooks && hooks.cur && hooks.cur.finish ) {
        hooks.cur.finish.call( this );
      }

look for any active animations, and finish them

      for ( index = timers.length; index--; ) {
        if ( timers[ index ].elem === this && timers[ index ].queue === type ) {
          timers[ index ].anim.stop( true );
          timers.splice( index, 1 );
        }
      }

look for any animations in the old queue and finish them

      for ( index = 0; index < length; index++ ) {
        if ( queue[ index ] && queue[ index ].finish ) {
          queue[ index ].finish.call( this );
        }
      }

turn off finishing flag

      delete data.finish;
    });
  }
});

Generate parameters to create a standard animation

function genFx( type, includeWidth ) {
  var which,
    attrs = { height: type },
    i = 0;

if we include width, step value is 1 to do all cssExpand values, if we don't include width, step value is 2 to skip over Left and Right

  includeWidth = includeWidth? 1 : 0;
  for( ; i < 4 ; i += 2 - includeWidth ) {
    which = cssExpand[ i ];
    attrs[ "margin" + which ] = attrs[ "padding" + which ] = type;
  }

  if ( includeWidth ) {
    attrs.opacity = attrs.width = type;
  }

  return attrs;
}

Generate shortcuts for custom animations

jQuery.each({
  slideDown: genFx("show"),
  slideUp: genFx("hide"),
  slideToggle: genFx("toggle"),
  fadeIn: { opacity: "show" },
  fadeOut: { opacity: "hide" },
  fadeToggle: { opacity: "toggle" }
}, function( name, props ) {
  jQuery.fn[ name ] = function( speed, easing, callback ) {
    return this.animate( props, speed, easing, callback );
  };
});

jQuery.speed = function( speed, easing, fn ) {
  var opt = speed && typeof speed === "object" ? jQuery.extend( {}, speed ) : {
    complete: fn || !fn && easing ||
      jQuery.isFunction( speed ) && speed,
    duration: speed,
    easing: fn && easing || easing && !jQuery.isFunction( easing ) && easing
  };

  opt.duration = jQuery.fx.off ? 0 : typeof opt.duration === "number" ? opt.duration :
    opt.duration in jQuery.fx.speeds ? jQuery.fx.speeds[ opt.duration ] : jQuery.fx.speeds._default;

normalize opt.queue - true/undefined/null -> "fx"

  if ( opt.queue == null || opt.queue === true ) {
    opt.queue = "fx";
  }

Queueing

  opt.old = opt.complete;

  opt.complete = function() {
    if ( jQuery.isFunction( opt.old ) ) {
      opt.old.call( this );
    }

    if ( opt.queue ) {
      jQuery.dequeue( this, opt.queue );
    }
  };

  return opt;
};

jQuery.easing = {
  linear: function( p ) {
    return p;
  },
  swing: function( p ) {
    return 0.5 - Math.cos( p*Math.PI ) / 2;
  }
};

jQuery.timers = [];
jQuery.fx = Tween.prototype.init;
jQuery.fx.tick = function() {
  var timer,
    timers = jQuery.timers,
    i = 0;

  fxNow = jQuery.now();

  for ( ; i < timers.length; i++ ) {
    timer = timers[ i ];

Checks the timer has not already been removed

    if ( !timer() && timers[ i ] === timer ) {
      timers.splice( i--, 1 );
    }
  }

  if ( !timers.length ) {
    jQuery.fx.stop();
  }
  fxNow = undefined;
};

jQuery.fx.timer = function( timer ) {
  if ( timer() && jQuery.timers.push( timer ) ) {
    jQuery.fx.start();
  }
};

jQuery.fx.interval = 13;

jQuery.fx.start = function() {
  if ( !timerId ) {
    timerId = setInterval( jQuery.fx.tick, jQuery.fx.interval );
  }
};

jQuery.fx.stop = function() {
  clearInterval( timerId );
  timerId = null;
};

jQuery.fx.speeds = {
  slow: 600,
  fast: 200,

Default speed

  _default: 400
};

Back Compat <1.8 extension point

jQuery.fx.step = {};

if ( jQuery.expr && jQuery.expr.filters ) {
  jQuery.expr.filters.animated = function( elem ) {
    return jQuery.grep(jQuery.timers, function( fn ) {
      return elem === fn.elem;
    }).length;
  };
}
jQuery.fn.offset = function( options ) {
  if ( arguments.length ) {
    return options === undefined ?
      this :
      this.each(function( i ) {
        jQuery.offset.setOffset( this, options, i );
      });
  }

  var docElem, win,
    box = { top: 0, left: 0 },
    elem = this[ 0 ],
    doc = elem && elem.ownerDocument;

  if ( !doc ) {
    return;
  }

  docElem = doc.documentElement;

Make sure it's not a disconnected DOM node

  if ( !jQuery.contains( docElem, elem ) ) {
    return box;
  }

If we don't have gBCR, just use 0,0 rather than error BlackBerry 5, iOS 3 (original iPhone)

  if ( typeof elem.getBoundingClientRect !== core_strundefined ) {
    box = elem.getBoundingClientRect();
  }
  win = getWindow( doc );
  return {
    top: box.top  + ( win.pageYOffset || docElem.scrollTop )  - ( docElem.clientTop  || 0 ),
    left: box.left + ( win.pageXOffset || docElem.scrollLeft ) - ( docElem.clientLeft || 0 )
  };
};

jQuery.offset = {

  setOffset: function( elem, options, i ) {
    var position = jQuery.css( elem, "position" );

set position first, in-case top/left are set even on static elem

    if ( position === "static" ) {
      elem.style.position = "relative";
    }

    var curElem = jQuery( elem ),
      curOffset = curElem.offset(),
      curCSSTop = jQuery.css( elem, "top" ),
      curCSSLeft = jQuery.css( elem, "left" ),
      calculatePosition = ( position === "absolute" || position === "fixed" ) && jQuery.inArray("auto", [curCSSTop, curCSSLeft]) > -1,
      props = {}, curPosition = {}, curTop, curLeft;

need to be able to calculate position if either top or left is auto and position is either absolute or fixed

    if ( calculatePosition ) {
      curPosition = curElem.position();
      curTop = curPosition.top;
      curLeft = curPosition.left;
    } else {
      curTop = parseFloat( curCSSTop ) || 0;
      curLeft = parseFloat( curCSSLeft ) || 0;
    }

    if ( jQuery.isFunction( options ) ) {
      options = options.call( elem, i, curOffset );
    }

    if ( options.top != null ) {
      props.top = ( options.top - curOffset.top ) + curTop;
    }
    if ( options.left != null ) {
      props.left = ( options.left - curOffset.left ) + curLeft;
    }

    if ( "using" in options ) {
      options.using.call( elem, props );
    } else {
      curElem.css( props );
    }
  }
};


jQuery.fn.extend({

  position: function() {
    if ( !this[ 0 ] ) {
      return;
    }

    var offsetParent, offset,
      parentOffset = { top: 0, left: 0 },
      elem = this[ 0 ];

fixed elements are offset from window (parentOffset = {top:0, left: 0}, because it is it's only offset parent

    if ( jQuery.css( elem, "position" ) === "fixed" ) {

we assume that getBoundingClientRect is available when computed position is fixed

      offset = elem.getBoundingClientRect();
    } else {

Get real offsetParent

      offsetParent = this.offsetParent();

Get correct offsets

      offset = this.offset();
      if ( !jQuery.nodeName( offsetParent[ 0 ], "html" ) ) {
        parentOffset = offsetParent.offset();
      }

Add offsetParent borders

      parentOffset.top  += jQuery.css( offsetParent[ 0 ], "borderTopWidth", true );
      parentOffset.left += jQuery.css( offsetParent[ 0 ], "borderLeftWidth", true );
    }

Subtract parent offsets and element margins note: when an element has margin: auto the offsetLeft and marginLeft are the same in Safari causing offset.left to incorrectly be 0

    return {
      top:  offset.top  - parentOffset.top - jQuery.css( elem, "marginTop", true ),
      left: offset.left - parentOffset.left - jQuery.css( elem, "marginLeft", true)
    };
  },

  offsetParent: function() {
    return this.map(function() {
      var offsetParent = this.offsetParent || document.documentElement;
      while ( offsetParent && ( !jQuery.nodeName( offsetParent, "html" ) && jQuery.css( offsetParent, "position") === "static" ) ) {
        offsetParent = offsetParent.offsetParent;
      }
      return offsetParent || document.documentElement;
    });
  }
});

Create scrollLeft and scrollTop methods

jQuery.each( {scrollLeft: "pageXOffset", scrollTop: "pageYOffset"}, function( method, prop ) {
  var top = /Y/.test( prop );

  jQuery.fn[ method ] = function( val ) {
    return jQuery.access( this, function( elem, method, val ) {
      var win = getWindow( elem );

      if ( val === undefined ) {
        return win ? (prop in win) ? win[ prop ] :
          win.document.documentElement[ method ] :
          elem[ method ];
      }

      if ( win ) {
        win.scrollTo(
          !top ? val : jQuery( win ).scrollLeft(),
          top ? val : jQuery( win ).scrollTop()
        );

      } else {
        elem[ method ] = val;
      }
    }, method, val, arguments.length, null );
  };
});

function getWindow( elem ) {
  return jQuery.isWindow( elem ) ?
    elem :
    elem.nodeType === 9 ?
      elem.defaultView || elem.parentWindow :
      false;
}

Create innerHeight, innerWidth, height, width, outerHeight and outerWidth methods

jQuery.each( { Height: "height", Width: "width" }, function( name, type ) {
  jQuery.each( { padding: "inner" + name, content: type, "": "outer" + name }, function( defaultExtra, funcName ) {

margin is only for outerHeight, outerWidth

    jQuery.fn[ funcName ] = function( margin, value ) {
      var chainable = arguments.length && ( defaultExtra || typeof margin !== "boolean" ),
        extra = defaultExtra || ( margin === true || value === true ? "margin" : "border" );

      return jQuery.access( this, function( elem, type, value ) {
        var doc;

        if ( jQuery.isWindow( elem ) ) {

As of 5/8/2012 this will yield incorrect results for Mobile Safari, but there isn't a whole lot we can do. See pull request at this URL for discussion: https://github.com/jquery/jquery/pull/764

          return elem.document.documentElement[ "client" + name ];
        }

Get document width or height

        if ( elem.nodeType === 9 ) {
          doc = elem.documentElement;

Either scroll[Width/Height] or offset[Width/Height] or client[Width/Height], whichever is greatest unfortunately, this causes bug #3838 in IE6/8 only, but there is currently no good, small way to fix it.

          return Math.max(
            elem.body[ "scroll" + name ], doc[ "scroll" + name ],
            elem.body[ "offset" + name ], doc[ "offset" + name ],
            doc[ "client" + name ]
          );
        }

        return value === undefined ?

Get width or height on the element, requesting but not forcing parseFloat

          jQuery.css( elem, type, extra ) :

Set width or height on the element

          jQuery.style( elem, type, value, extra );
      }, type, chainable ? margin : undefined, chainable, null );
    };
  });
});

Limit scope pollution from any deprecated API (function() {

})(); Expose jQuery to the global object

window.jQuery = window.$ = jQuery;

Expose jQuery as an AMD module, but only for AMD loaders that understand the issues with loading multiple versions of jQuery in a page that all might call define(). The loader will indicate they have special allowances for multiple jQuery versions by specifying define.amd.jQuery = true. Register as a named module, since jQuery can be concatenated with other files that may use define, but not use a proper concatenation script that understands anonymous AMD modules. A named AMD is safest and most robust way to register. Lowercase jquery is used because AMD module names are derived from file names, and jQuery is normally delivered in a lowercase file name. Do this after creating the global so that if an AMD module wants to call noConflict to hide this version of jQuery, it will work.

if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
  define( "jquery", [], function () { return jQuery; } );
}

})( window );