<?xml version="1.0" encoding="UTF-8"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<!-- $Id$ -->
<testcase>
  <info>
    <p>
      This test checks inline level baseline-shift.
    </p>
  </info>
  <fo>
    <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:svg="http://www.w3.org/2000/svg">
      <fo:layout-master-set>
        <fo:simple-page-master master-name="normal" page-width="5in" page-height="5in">
          <fo:region-body/>
        </fo:simple-page-master>
      </fo:layout-master-set>
      <fo:page-sequence master-reference="normal" white-space-collapse="true">
        <fo:flow flow-name="xsl-region-body">
          <fo:block background-color="silver" margin="1pt 0pt 1pt 0pt" font-size="16pt">
            Before
            <fo:inline font-size="50%" 
                alignment-baseline="central" 
                baseline-shift="6pt" 
                background-color="yellow">6pt central
            </fo:inline>
            <fo:inline font-size="50%" 
                alignment-baseline="central" 
                background-color="orange">central
            </fo:inline>
            After
          </fo:block>
          <fo:block background-color="silver" margin="1pt 0pt 1pt 0pt" font-size="16pt">
            Before
            <fo:inline font-size="50%" 
                alignment-baseline="central" 
                baseline-shift="-6pt" 
                background-color="yellow">-6pt central
            </fo:inline>
            <fo:inline font-size="50%" 
                alignment-baseline="central" 
                background-color="orange">central
            </fo:inline>
            After
          </fo:block>
          <fo:block background-color="silver" margin="1pt 0pt 1pt 0pt" font-size="16pt">
            Before
            <fo:inline font-size="50%" 
                alignment-baseline="central" 
                baseline-shift="sub" 
                background-color="yellow">sub
              <fo:inline font-size="150%" 
                  alignment-baseline="text-before-edge" 
                  background-color="red">text-before-edge
                  <fo:inline font-size="6pt"
                      background-color="green">Baseline unchanged</fo:inline>                  
              </fo:inline>central
            </fo:inline>
            After
          </fo:block>
          <fo:block background-color="silver" margin="1pt 0pt 1pt 0pt" font-size="16pt">
            Before
            <fo:inline font-size="50%" 
                alignment-baseline="central" 
                baseline-shift="super" 
                background-color="yellow">super
              <fo:inline font-size="150%" 
                  alignment-baseline="text-after-edge" 
                  background-color="red">text-after-edge
                  <fo:inline font-size="6pt"
                      background-color="green">Baseline unchanged</fo:inline>                  
              </fo:inline>central
            </fo:inline>
            After
          </fo:block>
          <fo:block background-color="silver" margin="1pt 0pt 1pt 0pt" font-size="16pt">
            Before
            <fo:inline font-size="50%" 
                alignment-baseline="central" 
                baseline-shift="sub" 
                background-color="yellow">sub
              <fo:inline font-size="150%" 
                  dominant-baseline="text-before-edge" 
                  background-color="red">text-before-edge
                  <fo:inline font-size="6pt"
                      background-color="green">Baseline changed</fo:inline>                  
              </fo:inline>central
            </fo:inline>
            After
          </fo:block>
          <fo:block background-color="silver" margin="1pt 0pt 1pt 0pt" font-size="16pt">
            Before
            <fo:inline font-size="50%" 
                alignment-baseline="central" 
                baseline-shift="super" 
                background-color="yellow">super
              <fo:inline font-size="150%" 
                  dominant-baseline="text-after-edge" 
                  background-color="red">text-after-edge
                  <fo:inline font-size="6pt"
                      background-color="green">Baseline changed</fo:inline>                  
              </fo:inline>central
            </fo:inline>
            After
          </fo:block>
        </fo:flow>
      </fo:page-sequence>
    </fo:root>
  </fo>
  <checks>
    <eval
/*!
 * jQuery UI Tabs @VERSION
 * http://jqueryui.com
 *
 * Copyright jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 */

//>>label: Tabs
//>>group: Widgets
//>>description: Transforms a set of container elements into a tab structure.
//>>docs: http://api.jqueryui.com/tabs/
//>>demos: http://jqueryui.com/tabs/
//>>css.structure: ../../themes/base/core.css
//>>css.structure: ../../themes/base/tabs.css
//>>css.theme: ../../themes/base/theme.css

( function( factory ) {
	if ( typeof define === "function" && define.amd ) {

		// AMD. Register as an anonymous module.
		define( [
			"jquery",
			"../escape-selector",
			"../keycode",
			"../safe-active-element",
			"../unique-id",
			"../version",
			"../widget"
		], factory );
	} else {

		// Browser globals
		factory( jQuery );
	}
}( function( $ ) {

$.widget( "ui.tabs", {
	version: "@VERSION",
	delay: 300,
	options: {
		active: null,
		classes: {
			"ui-tabs": "ui-corner-all",
			"ui-tabs-nav": "ui-corner-all",
			"ui-tabs-panel": "ui-corner-bottom",
			"ui-tabs-tab": "ui-corner-top"
		},
		collapsible: false,
		event: "click",
		heightStyle: "content",
		hide: null,
		show: null,

		// Callbacks
		activate: null,
		beforeActivate: null,
		beforeLoad: null,
		load: null
	},

	_isLocal: ( function() {
		var rhash = /#.*$/;

		return function( anchor ) {
			var anchorUrl, locationUrl;

			anchorUrl = anchor.href.replace( rhash, "" );
			locationUrl = location.href.replace( rhash, "" );

			// Decoding may throw an error if the URL isn't UTF-8 (#9518)
			try {
				anchorUrl = decodeURIComponent( anchorUrl );
			} catch ( error ) {}
			try {
				locationUrl = decodeURIComponent( locationUrl );
			} catch ( error ) {}

			return anchor.hash.length > 1 && anchorUrl === locationUrl;
		};
	} )(),

	_create: function() {
		var that = this,
			options = this.options;

		this.running = false;

		this._addClass( "ui-tabs", "ui-widget ui-widget-content" );
		this._toggleClass( "ui-tabs-collapsible", null, options.collapsible );

		this._processTabs();
		options.active = this._initialActive();

		// Take disabling tabs via class attribute from HTML
		// into account and update option properly.
		if ( $.isArray( options.disabled ) ) {
			options.disabled = $.unique( options.disabled.concat(
				$.map( this.tabs.filter( ".ui-state-disabled" ), function( li ) {
					return that.tabs.index( li );
				} )
			) ).sort();
		}

		// Check for length avoids error when initializing empty list
		if ( this.options.active !== false && this.anchors.length ) {
			this.active = this._findActive( options.active );
		} else {
			this.active = $();
		}

		this._refresh();

		if ( this.active.length ) {
			this.load( options.active );
		}
	},

	_initialActive: function() {
		var active = this.options.active,
			collapsible = this.options.collapsible,
			locationHash = location.hash.substring( 1 );

		if ( active === null ) {

			// check the fragment identifier in the URL
			if ( locationHash ) {
				this.tabs.each( function( i, tab ) {
					if ( $( tab ).attr( "aria-controls" ) === locationHash ) {
						active = i;
						return false;
					}
				} );
			}

			// Check for a tab marked active via a class
			if ( active === null ) {
				active = this.tabs.index( this.tabs.filter( ".ui-tabs-active" ) );
			}

			// No active tab, set to false
			if ( active === null || active === -1 ) {
				active = this.tabs.length ? 0 : false;
			}
		}

		// Handle numbers: negative, out of range
		if ( active !== false ) {
			active = this.tabs.index( this.tabs.eq( active ) );
			if ( active === -1 ) {
				active = collapsible ? false : 0;
			}
		}

		// Don't allow collapsible: false and active: false
		if ( !collapsible && active === false && this.anchors.length ) {
			active = 0;
		}

		return active;
	},

	_getCreateEventData: function() {
		return {
			tab: this.active,
			panel: !this.active.length ? $() : this._getPanelForTab( this.active )
		};
	},

	_tabKeydown: function( event ) {
		var focusedTab = $( $.ui.safeActiveElement( this.document[ 0 ] ) ).closest( "li" ),
			selectedIndex = this.tabs.index( focusedTab ),
			goingForward = true;

		if ( this._handlePageNav( event ) ) {
			return;
		}

		switch ( event.keyCode ) {
		case $.ui.keyCode.RIGHT:
		case $.ui.keyCode.DOWN:
			selectedIndex++;
			break;
		case $.ui.keyCode.UP:
		case $.ui.keyCode.LEFT:
			goingForward = false;
			selectedIndex--;
			break;
		case $.ui.keyCode.END:
			selectedIndex = this.anchors.length - 1;
			break;
		case $.ui.keyCode.HOME:
			selectedIndex = 0;
			break;
		case $.ui.keyCode.SPACE:

			// Activate only, no collapsing
			event.preventDefault();
			clearTimeout( this.activating );
			this._activate( selectedIndex );
			return;
		case $.ui.keyCode.ENTER:

			// Toggle (cancel delayed activation, allow collapsing)
			event.preventDefault();
			clearTimeout( this.activating );

			// Determine if we should collapse or activate
			this._activate( selectedIndex === this.options.active ? false : selectedIndex );
			return;
		default:
			return;
		}

		// Focus the appropriate tab, based on which key was pressed
		event.preventDefault();
		clearTimeout( this.activating );
		selectedIndex = this._focusNextTab( selectedIndex, goingForward );

		// Navigating with control/command key will prevent automatic activation
		if ( !event.ctrlKey && !event.metaKey ) {

			// Update aria-selected immediately so that AT think the tab is already selected.
			// Otherwise AT may confuse the user by stating that they need to activate the tab,
			// but the tab will already be activated by the time the announcement finishes.
			focusedTab.attr( "aria-selected", "false" );
			this.tabs.eq( selectedIndex ).attr( "aria-selected", "true" );

			this.activating = this._delay( function() {
				this.option( "active", selectedIndex );
			}, this.delay );
		}
	},

	_panelKeydown: function( event ) {
		if ( this._handlePageNav( event ) ) {
			return;
		}

		// Ctrl+up moves focus to the current tab
		if ( event.ctrlKey && event.keyCode === $.ui.keyCode.UP ) {
			event.preventDefault();
			this.active.trigger( "focus" );
		}
	},

	// Alt+page up/down moves focus to the previous/next tab (and activates)
	_handlePageNav: function( event ) {
		if ( event.altKey && event.keyCode === $.ui.keyCode.PAGE_UP ) {
			this._activate( this._focusNextTab( this.options.active - 1, false ) );
			return true;
		}
		if ( event.altKey && event.keyCode === $.ui.keyCode.PAGE_DOWN ) {
			this._activate( this._focusNextTab( this.options.active + 1, true ) );
			return true;
		}
	},

	_findNextTab: function( index, goingForward ) {
		var lastTabIndex = this.tabs.length - 1;

		function constrain() {
			if ( index > lastTabIndex ) {
				index = 0;
			}
			if ( index < 0 ) {
				index = lastTabIndex;
			}
			return index;
		}

		while ( $.inArray( constrain(), this.options.disabled ) !== -1 ) {
			index = goingForward ? index + 1 : index - 1;
		}

		return index;
	},

	_focusNextTab: function( index, goingForward ) {
		index = this._findNextTab( index, goingForward );
		this.tabs.eq( index ).trigger( "focus" );
		return index;
	},

	_setOption: function( key, value ) {
		if ( key === "active" ) {

			// _activate() will handle invalid values and update this.options
			this._activate( value );
			return;
		}

		this._super( key, value );

		if ( key === "collapsible" ) {
			this._toggleClass( "ui-tabs-collapsible", null, value );

			// Setting collapsible: false while collapsed; open first panel
			if ( !value && this.options.active === false ) {
				this._activate( 0 );
			}
		}

		if ( key === "event" ) {
			this._setupEvents( value );
		}

		if ( key === "heightStyle" ) {
			this._setupHeightStyle( value );
		}
	},

	_sanitizeSelector: function( hash ) {
		return hash ? hash.replace( /[!"$%&'()*+,.\/:;<=>?@\[\]\^`{|}~]/g, "\\$&" ) : "";
	},

	refresh: function() {
		var options = this.options,
			lis = this.tablist.children( ":has(a[href])" );

		// Get disabled tabs from class attribute from HTML
		// this will get converted to a boolean if needed in _refresh()
		options.disabled = $.map( lis.filter( ".ui-state-disabled" ), function( tab ) {
			return lis.index( tab );
		} );

		this._processTabs();

		// Was collapsed or no tabs
		if ( options.active === false || !this.anchors.length ) {
			options.active = false;
			this.active = $();

		// was active, but active tab is gone
		} else if ( this.active.length && !$.contains( this.tablist[ 0 ], this.active[ 0 ] ) ) {

			// all remaining tabs are disabled
			if ( this.tabs.length === options.disabled.length ) {
				options.active = false;
				this.active = $();

			// activate previous tab
			} else {
				this._activate( this._findNextTab( Math.max( 0, options.active - 1 ), false ) );
			}

		// was active, active tab still exists
		} else {

			// make sure active index is correct
			options.active = this.tabs.index( this.active );
		}

		this._refresh();
	},

	_refresh: function() {
		this._setOptionDisabled( this.options.disabled );
		this._setupEvents( this.options.event );
		this._setupHeightStyle( this.options.heightStyle );

		this.tabs.not( this.active ).attr( {
			"aria-selected": "false",
			"aria-expanded": "false",
			tabIndex: -1
		} );
		this.panels.not( this._getPanelForTab( this.active ) )
			.hide()
			.attr( {
				"aria-hidden": "true"
			} );

		// Make sure one tab is in the tab order
		if ( !this.active.length ) {
			this.tabs.eq( 0 ).attr( "tabIndex", 0 );
		} else {
			this.active
				.attr( {
					"aria-selected": "true",
					"aria-expanded": "true",
					tabIndex: 0
				} );
			this._addClass( this.active, "ui-tabs-active", "ui-state-active" );
			this._getPanelForTab( this.active )
				.show()
				.attr( {
					"aria-hidden": "false"
				} );
		}
	},

	_processTabs: function() {
		var that = this,
			prevTabs = this.tabs,
			prevAnchors = this.anchors,
			prevPanels = this.panels;

		this.tablist = this._getList().attr( "role", "tablist" );
		this._addClass( this.tablist, "ui-tabs-nav",
			"ui-helper-reset ui-helper-clearfix ui-widget-header" );

		// Prevent users from focusing disabled tabs via click
		this.tablist
			.on( "mousedown" + this.eventNamespace, "> li", function( event ) {
				if ( $( this ).is( ".ui-state-disabled" ) ) {
					event.preventDefault();
				}
			} )

			// Support: IE <9
			// Preventing the default action in mousedown doesn't prevent IE
			// from focusing the element, so if the anchor gets focused, blur.
			// We don't have to worry about focusing the previously focused
			// element since clicking on a non-focusable element should focus
			// the body anyway.
			.on( "focus" + this.eventNamespace, ".ui-tabs-anchor", function() {
				if ( $( this ).closest( "li" ).is( ".ui-state-disabled" ) ) {
					this.blur();
				}
			} );

		this.tabs = this.tablist.find( "> li:has(a[href])" )
			.attr( {
				role: "tab",
				tabIndex: -1
			} );
		this._addClass( this.tabs, "ui-tabs-tab", "ui-state-default" );

		this.anchors = this.tabs.map( function() {
			return $( "a", this )[ 0 ];
		} )
			.attr( {
				role: "presentation",
				tabIndex: -1
			} );
		this._addClass( this.anchors, "ui-tabs-anchor" );

		this.panels = $();

		this.anchors.each( function( i, anchor ) {
			var selector, panel, panelId,
				anchorId = $( anchor ).uniqueId().attr( "id" ),
				tab = $( anchor ).closest( "li" ),
				originalAriaControls = tab.attr( "aria-controls" );

			// Inline tab
			if ( that._isLocal( anchor ) ) {
				selector = anchor.hash;
				panelId = selector.substring( 1 );
				panel = that.element.find( that._sanitizeSelector( selector ) );

			// remote tab
			} else {

				// If the tab doesn't already have aria-controls,
				// generate an id by using a throw-away element
				panelId = tab.attr( "aria-controls" ) || $( {} ).uniqueId()[ 0 ].id;
				selector = "#" + panelId;
				panel = that.element.find( selector );
				if ( !panel.length ) {
					panel = that._createPanel( panelId );
					panel.insertAfter( that.panels[ i - 1 ] || that.tablist );
				}
				panel.attr( "aria-live", "polite" );
			}

			if ( panel.length ) {
				that.panels = that.panels.add( panel );
			}
			if ( originalAriaControls ) {
				tab.data( "ui-tabs-aria-controls", originalAriaControls );
			}
			tab.attr( {
				"aria-controls": panelId,
				"aria-labelledby": anchorId
			} );
			panel.attr( "aria-labelledby", anchorId );
		} );

		this.panels.attr( "role", "tabpanel" );
		this._addClass( this.panels, "ui-tabs-panel", "ui-widget-content" );

		// Avoid memory leaks (#10056)
		if ( prevTabs ) {
			this._off( prevTabs.not( this.tabs ) );
			this._off( prevAnchors.not( this.anchors ) );
			this._off( prevPanels.not( this.panels ) );
		}
	},

	// Allow overriding how to find the list for rare usage scenarios (#7715)
	_getList: function() {
		return this.tablist || this.element.find( "ol, ul" ).eq( 0 );
	},

	_createPanel: function( id ) {
		return $( "<div>" )
			.attr( "id", id )
			.data( "ui-tabs-destroy", true );
	},

	_setOptionDisabled: function( disabled ) {
		var currentItem, li, i;

		if ( $.isArray( disabled ) ) {
			if ( !disabled.length ) {
				disabled = false;
			} else if ( disabled.length === this.anchors.length ) {
				disabled = true;
			}
		}

		// Disable tabs
		for ( i = 0; ( li = this.tabs[ i ] ); i++ ) {
			currentItem = $( li );
			if ( disabled === true || $.inArray( i, disabled ) !== -1 ) {
				currentItem.attr( "aria-disabled", "true" );
				this._addClass( currentItem, null, "ui-state-disabled" );
			} else {
				currentItem.removeAttr( "aria-disabled" );
				this._removeClass( currentItem, null, "ui-state-disabled" );
			}
		}

		this.options.disabled = disabled;

		this._toggleClass( this.widget(), this.widgetFullName + "-disabled", null,
			disabled === true );
	},

	_setupEvents: function( event ) {
		var events = {};
		if ( event ) {
			$.each( event.split( " " ), function( index, eventName ) {
				events[ eventName ] = "_eventHandler";
			} );
		}

		this._off( this.anchors.add( this.tabs ).add( this.panels ) );

		// Always prevent the default action, even when disabled
		this._on( true, this.anchors, {
			click: function( event ) {
				event.preventDefault();
			}
		} );
		this._on( this.anchors, events );
		this._on( this.tabs, { keydown: "_tabKeydown" } );
		this._on( this.panels, { keydown: "_panelKeydown" } );

		this._focusable( this.tabs );
		this._hoverable( this.tabs );
	},

	_setupHeightStyle: function( heightStyle ) {
		var maxHeight,
			parent = this.element.parent();

		if ( heightStyle === "fill" ) {
			maxHeight = parent.height();
			maxHeight -= this.element.outerHeight() - this.element.height();

			this.element.siblings( ":visible" ).each( function() {
				var elem = $( this ),
					position = elem.css( "position" );

				if ( position === "absolute" || position === "fixed" ) {
					return;
				}
				maxHeight -= elem.outerHeight( true );
			} );

			this.element.children().not( this.panels ).each( function() {
				maxHeight -= $( this ).outerHeight( true );
			} );

			this.panels.each( function() {
				$( this ).height( Math.max( 0, maxHeight -
					$( this ).innerHeight() + $( this ).height() ) );
			} )
				.css( "overflow", "auto" );
		} else if ( heightStyle === "auto" ) {
			maxHeight = 0;
			this.panels.each( function() {
				maxHeight = Math.max( maxHeight, $( this ).height( "" ).height() );
			} ).height( maxHeight );
		}
	},

	_eventHandler: function( event ) {
		var options = this.options,
			active = this.active,
			anchor = $( event.currentTarget ),
			tab = anchor.closest( "li" ),
			clickedIsActive = tab[ 0 ] === active[ 0 ],
			collapsing = clickedIsActive && options.collapsible,
			toShow = collapsing ? $() : this._getPanelForTab( tab ),
			toHide = !active.length ? $() : this._getPanelForTab( active ),
			eventData = {
				oldTab: active,
				oldPanel: toHide,
				newTab: collapsing ? $() : tab,
				newPanel: toShow
			};

		event.preventDefault();

		if ( tab.hasClass( "ui-state-disabled" ) ||

				// tab is already loading
				tab.hasClass( "ui-tabs-loading" ) ||

				// can't switch durning an animation
				this.running ||

				// click on active header, but not collapsible
				( clickedIsActive && !options.collapsible ) ||

				// allow canceling activation
				( this._trigger( "beforeActivate", event, eventData ) === false ) ) {
			return;
		}

		options.active = collapsing ? false : this.tabs.index( tab );

		this.active = clickedIsActive ? $() : tab;
		if ( this.xhr ) {
			this.xhr.abort();
		}

		if ( !toHide.length && !toShow.length ) {
			$.error( "jQuery UI Tabs: Mismatching fragment identifier." );
		}

		if ( toShow.length ) {
			this.load( this.tabs.index( tab ), event );
		}
		this._toggle( event, eventData );
	},

	// Handles show/hide for selecting tabs
	_toggle: function( event, eventData ) {
		var that = this,
			toShow = eventData.newPanel,
			toHide = eventData.oldPanel;

		this.running = true;

		function complete() {
			that.running = false;
			that._trigger( "activate", event, eventData );
		}

		function show() {
			that._addClass( eventData.newTab.closest( "li" ), "ui-tabs-active", "ui-state-active" );

			if ( toShow.length && that.options.show ) {
				that._show( toShow, that.options.show, complete );
			} else {
				toShow.show();
				complete();
			}
		}

		// Start out by hiding, then showing, then completing
		if ( toHide.length && this.options.hide ) {
			this._hide( toHide, this.options.hide, function() {
				that._removeClass( eventData.oldTab.closest( "li" ),
					"ui-tabs-active", "ui-state-active" );
				show();
			} );
		} else {
			this._removeClass( eventData.oldTab.closest( "li" ),
				"ui-tabs-active", "ui-state-active" );
			toHide.hide();
			show();
		}

		toHide.attr( "aria-hidden", "true" );
		eventData.oldTab.attr( {
			"aria-selected": "false",
			"aria-expanded": "false"
		} );

		// If we're switching tabs, remove the old tab from the tab order.
		// If we're opening from collapsed state, remove the previous tab from the tab order.
		// If we're collapsing, then keep the collapsing tab in the tab order.
		if ( toShow.length && toHide.length ) {
			eventData.oldTab.attr( "tabIndex", -1 );
		} else if ( toShow.length ) {
			this.tabs.filter( function() {
				return $( this ).attr( "tabIndex" ) === 0;
			} )
				.attr( "tabIndex", -1 );
		}

		toShow.attr( "aria-hidden", "false" );
		eventData.newTab.attr( {
			"aria-selected": "true",
			"aria-expanded": "true",
			tabIndex: 0
		} );
	},

	_activate: function( index ) {
		var anchor,
			active = this._findActive( index );

		// Trying to activate the already active panel
		if ( active[ 0 ] === this.active[ 0 ] ) {
			return;
		}

		// Trying to collapse, simulate a click on the current active header
		if ( !active.length ) {
			active = this.active;
		}

		anchor = active.find( ".ui-tabs-anchor" )[ 0 ];
		this._eventHandler( {
			target: anchor,
			currentTarget: anchor,
			preventDefault: $.noop
		} );
	},

	_findActive: function( index ) {
		return index === false ? $() : this.tabs.eq( index );
	},

	_getIndex: function( index ) {

		// meta-function to give users option to provide a href string instead of a numerical index.
		if ( typeof index === "string" ) {
			index = this.anchors.index( this.anchors.filter( "[href$='" +
				$.ui.escapeSelector( index ) + "']" ) );
		}

		return index;
	},

	_destroy: function() {
		if ( this.xhr ) {
			this.xhr.abort();
		}

		this.tablist
			.removeAttr( "role" )
			.off( this.eventNamespace );

		this.anchors
			.removeAttr( "role tabIndex" )
			.removeUniqueId();

		this.tabs.add( this.panels ).each( function() {
			if ( $.data( this, "ui-tabs-destroy" ) ) {
				$( this ).remove();
			} else {
				$( this ).removeAttr( "role tabIndex " +
					"aria-live aria-busy aria-selected aria-labelledby aria-hidden aria-expanded" );
			}
		} );

		this.tabs.each( function() {
			var li = $( this ),
				prev = li.data( "ui-tabs-aria-controls" );
			if ( prev ) {
				li
					.attr( "aria-controls", prev )
					.removeData( "ui-tabs-aria-controls" );
			} else {
				li.removeAttr( "aria-controls" );
			}
		} );

		this.panels.show();

		if ( this.options.heightStyle !== "content" ) {
			this.panels.css( "height", "" );
		}
	},

	enable: function( index ) {
		var disabled = this.options.disabled;
		if ( disabled === false ) {
			return;
		}

		if ( index === undefined ) {
			disabled = false;
		} else {
			index = this._getIndex( index );
			if ( $.isArray( disabled ) ) {
				disabled = $.map( disabled, function( num ) {
					return num !== index ? num : null;
				} );
			} else {
				disabled = $.map( this.tabs, function( li, num ) {
					return num !== index ? num : null;
				} );
			}
		}
		this._setOptionDisabled( disabled );
	},

	disable: function( index ) {
		var disabled = this.options.disabled;
		if ( disabled === true ) {
			return;
		}

		if ( index === undefined ) {
			disabled = true;
		} else {
			index = this._getIndex( index );
			if ( $.inArray( index, disabled ) !== -1 ) {
				return;
			}
			if ( $.isArray( disabled ) ) {
				disabled = $.merge( [ index ], disabled ).sort();
			} else {
				disabled = [ index ];
			}
		}
		this._setOptionDisabled( disabled );
	},

	load: function( index, event ) {
		index = this._getIndex( index );
		var that = this,
			tab = this.tabs.eq( index ),
			anchor = tab.find( ".ui-tabs-anchor" ),
			panel = this._getPanelForTab( tab ),
			eventData = {
				tab: tab,
				panel: panel
			},
			complete = function( jqXHR, status ) {
				if ( status === "abort" ) {
					that.panels.stop( false, true );
				}

				that._removeClass( tab, "ui-tabs-loading" );
				panel.removeAttr( "aria-busy" );

				if ( jqXHR === that.xhr ) {
					delete that.xhr;
				}
			};

		// Not remote
		if ( this._isLocal( anchor[ 0 ] ) ) {
			return;
		}

		this.xhr = $.ajax( this._ajaxSettings( anchor, event, eventData ) );

		// Support: jQuery <1.8
		// jQuery <1.8 returns false if the request is canceled in beforeSend,
		// but as of 1.8, $.ajax() always returns a jqXHR object.
		if ( this.xhr && this.xhr.statusText !== "canceled" ) {
			this._addClass( tab, "ui-tabs-loading" );
			panel.attr( "aria-busy", "true" );

			this.xhr
				.done( function( response, status, jqXHR ) {

					// support: jQuery <1.8
					// http://bugs.jquery.com/ticket/11778
					setTimeout( function() {
						panel.html( response );
						that._trigger( "load", event, eventData );

						complete( jqXHR, status );
					}, 1 );
				} )
				.fail( function( jqXHR, status ) {

					// support: jQuery <1.8
					// http://bugs.jquery.com/ticket/11778
					setTimeout( function() {
						complete( jqXHR, status );
					}, 1 );
				} );
		}
	},

	_ajaxSettings: function( anchor, event, eventData ) {
		var that = this;
		return {

			// Support: IE <11 only
			// Strip any hash that exists to prevent errors with the Ajax request
			url: anchor.attr( "href" ).replace( /#.*$/, "" ),
			beforeSend: function( jqXHR, settings ) {
				return that._trigger( "beforeLoad", event,
					$.extend( { jqXHR: jqXHR, ajaxSettings: settings }, eventData ) );
			}
		};
	},

	_getPanelForTab: function( tab ) {
		var id = $( tab ).attr( "aria-controls" );
		return this.element.find( this._sanitizeSelector( "#" + id ) );
	}
} );

// DEPRECATED
// TODO: Switch return back to widget declaration at top of file when this is removed
if ( $.uiBackCompat !== false ) {

	// Backcompat for ui-tab class (now ui-tabs-tab)
	$.widget( "ui.tabs", $.ui.tabs, {
		_processTabs: function() {
			this._superApply( arguments );
			this._addClass( this.tabs, "ui-tab" );
		}
	} );
}

return $.ui.tabs;

} ) );