jquery/test/unit/offset.js

( function() {

if ( !jQuery.fn.offset ) {
	return;
}

var supportsScroll, supportsFixedPosition,
	forceScroll = jQuery( "<div/>" ).css( { width: 2000, height: 2000 } ),
	checkSupport = function() {

		// Only run once
		checkSupport = false;

		var checkFixed = jQuery( "<div/>" ).css( { position: "fixed", top: "20px" } ).appendTo( "#qunit-fixture" );

		// Must append to body because #qunit-fixture is hidden and elements inside it don't have a scrollTop
		forceScroll.appendTo( "body" );
		window.scrollTo( 200, 200 );
		supportsScroll = document.documentElement.scrollTop || document.body.scrollTop;
		forceScroll.detach();

		supportsFixedPosition = checkFixed[ 0 ].offsetTop === 20;
		checkFixed.remove();
	};

QUnit.module( "offset", { setup: function() {
	if ( typeof checkSupport === "function" ) {
		checkSupport();
	}

	// Force a scroll value on the main window to ensure incorrect results
	// if offset is using the scroll offset of the parent window
	forceScroll.appendTo( "body" );
	window.scrollTo( 1, 1 );
	forceScroll.detach();
}, teardown: moduleTeardown } );

QUnit.test( "empty set", function( assert ) {
	assert.expect( 2 );
	assert.strictEqual( jQuery().offset(), undefined, "offset() returns undefined for empty set (#11962)" );
	assert.strictEqual( jQuery().position(), undefined, "position() returns undefined for empty set (#11962)" );
} );

QUnit.test( "disconnected element", function( assert ) {
	assert.expect( 2 );

	var result = jQuery( document.createElement( "div" ) ).offset();

	// These tests are solely for master/compat consistency
	// Retrieving offset on disconnected/hidden elements is not officially
	// valid input, but will return zeros for back-compat
	assert.equal( result.top, 0, "Retrieving offset on disconnected elements returns zeros (gh-2310)" );
	assert.equal( result.left, 0, "Retrieving offset on disconnected elements returns zeros (gh-2310)" );
} );

QUnit.test( "hidden (display: none) element", function( assert ) {
	assert.expect( 2 );

	var node = jQuery( "<div style='display: none' />" ).appendTo( "#qunit-fixture" ),
		result = node.offset();

	node.remove();

	// These tests are solely for master/compat consistency
	// Retrieving offset on disconnected/hidden elements is not officially
	// valid input, but will return zeros for back-compat
	assert.equal( result.top, 0, "Retrieving offset on hidden elements returns zeros (gh-2310)" );
	assert.equal( result.left, 0, "Retrieving offset on hidden elements returns zeros (gh-2310)" );
} );

testIframe( "absolute", "offset/absolute.html", function( assert, $, iframe ) {
	assert.expect( 4 );

	var doc = iframe.document,
			tests;

	// get offset
	tests = [
		{ "id": "#absolute-1", "top": 1, "left": 1 }
	];
	jQuery.each( tests, function() {
		assert.equal( jQuery( this[ "id" ], doc ).offset().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').offset().top" );
		assert.equal( jQuery( this[ "id" ], doc ).offset().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').offset().left" );
	} );

	// get position
	tests = [
		{ "id": "#absolute-1", "top": 0, "left": 0 }
	];
	jQuery.each( tests, function() {
		assert.equal( jQuery( this[ "id" ], doc ).position().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').position().top" );
		assert.equal( jQuery( this[ "id" ], doc ).position().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').position().left" );
	} );
} );

testIframe( "absolute", "offset/absolute.html", function( assert, $ ) {
	assert.expect( 178 );

	var tests, offset;

	// get offset tests
	tests = [
		{ "id": "#absolute-1",     "top":  1, "left":  1 },
		{ "id": "#absolute-1-1",   "top":  5, "left":  5 },
		{ "id": "#absolute-1-1-1", "top":  9, "left":  9 },
		{ "id": "#absolute-2",     "top": 20, "left": 20 }
	];
	jQuery.each( tests, function() {
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').offset().top" );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').offset().left" );
	} );

	// get position
	tests = [
		{ "id": "#absolute-1",     "top":  0, "left":  0 },
		{ "id": "#absolute-1-1",   "top":  1, "left":  1 },
		{ "id": "#absolute-1-1-1", "top":  1, "left":  1 },
		{ "id": "#absolute-2",     "top": 19, "left": 19 }
	];
	jQuery.each( tests, function() {
		assert.equal( $( this[ "id" ] ).position().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').position().top" );
		assert.equal( $( this[ "id" ] ).position().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').position().left" );
	} );

	// test #5781
	offset = $( "#positionTest" ).offset( { "top": 10, "left": 10 } ).offset();
	assert.equal( offset.top,  10, "Setting offset on element with position absolute but 'auto' values." );
	assert.equal( offset.left, 10, "Setting offset on element with position absolute but 'auto' values." );

	// set offset
	tests = [
		{ "id": "#absolute-2",     "top": 30, "left": 30 },
		{ "id": "#absolute-2",     "top": 10, "left": 10 },
		{ "id": "#absolute-2",     "top": -1, "left": -1 },
		{ "id": "#absolute-2",     "top": 19, "left": 19 },
		{ "id": "#absolute-1-1-1", "top": 15, "left": 15 },
		{ "id": "#absolute-1-1-1", "top":  5, "left":  5 },
		{ "id": "#absolute-1-1-1", "top": -1, "left": -1 },
		{ "id": "#absolute-1-1-1", "top":  9, "left":  9 },
		{ "id": "#absolute-1-1",   "top": 10, "left": 10 },
		{ "id": "#absolute-1-1",   "top":  0, "left":  0 },
		{ "id": "#absolute-1-1",   "top": -1, "left": -1 },
		{ "id": "#absolute-1-1",   "top":  5, "left":  5 },
		{ "id": "#absolute-1",     "top":  2, "left":  2 },
		{ "id": "#absolute-1",     "top":  0, "left":  0 },
		{ "id": "#absolute-1",     "top": -1, "left": -1 },
		{ "id": "#absolute-1",     "top":  1, "left":  1 }
	];
	jQuery.each( tests, function() {
		$( this[ "id" ] ).offset( { "top": this[ "top" ], "left": this[ "left" ] } );
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').offset({ top: "  + this[ "top" ]  + " })" );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').offset({ left: " + this[ "left" ] + " })" );

		var top = this[ "top" ], left = this[ "left" ];

		$( this[ "id" ] ).offset( function( i, val ) {
			assert.equal( val.top, top, "Verify incoming top position." );
			assert.equal( val.left, left, "Verify incoming top position." );
			return { "top": top + 1, "left": left + 1 };
		} );
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ]  + 1, "jQuery('" + this[ "id" ] + "').offset({ top: "  + ( this[ "top" ]  + 1 ) + " })" );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ] + 1, "jQuery('" + this[ "id" ] + "').offset({ left: " + ( this[ "left" ] + 1 ) + " })" );

		$( this[ "id" ] )
			.offset( { "left": this[ "left" ] + 2 } )
			.offset( { "top":  this[ "top" ]  + 2 } );
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ]  + 2, "Setting one property at a time." );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ] + 2, "Setting one property at a time." );

		$( this[ "id" ] ).offset( { "top": this[ "top" ], "left": this[ "left" ], "using": function( props ) {
			$( this ).css( {
				"top":  props.top  + 1,
				"left": props.left + 1
			} );
		} } );
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ]  + 1, "jQuery('" + this[ "id" ] + "').offset({ top: "  + ( this[ "top" ]  + 1 ) + ", using: fn })" );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ] + 1, "jQuery('" + this[ "id" ] + "').offset({ left: " + ( this[ "left" ] + 1 ) + ", using: fn })" );
	} );
} );

testIframe( "relative", "offset/relative.html", function( assert, $ ) {
	assert.expect( 64 );

	// get offset
	var tests = [
		{ "id": "#relative-1",   "top":   7, "left":  7 },
		{ "id": "#relative-1-1", "top":  15, "left": 15 },
		{ "id": "#relative-2",   "top": 142, "left": 27 },
		{ "id": "#relative-2-1",   "top": 149, "left": 52 }
	];
	jQuery.each( tests, function() {
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').offset().top" );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').offset().left" );
	} );

	// get position
	tests = [
		{ "id": "#relative-1",   "top":   6, "left":  6 },
		{ "id": "#relative-1-1", "top":   5, "left":  5 },
		{ "id": "#relative-2",   "top": 141, "left": 26 },
		{ "id": "#relative-2-1",   "top": 5, "left": 5 }
	];
	jQuery.each( tests, function() {
		assert.equal( $( this[ "id" ] ).position().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').position().top" );
		assert.equal( $( this[ "id" ] ).position().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').position().left" );
	} );

	// set offset
	tests = [
		{ "id": "#relative-2",   "top": 200, "left":  50 },
		{ "id": "#relative-2",   "top": 100, "left":  10 },
		{ "id": "#relative-2",   "top":  -5, "left":  -5 },
		{ "id": "#relative-2",   "top": 142, "left":  27 },
		{ "id": "#relative-1-1", "top": 100, "left": 100 },
		{ "id": "#relative-1-1", "top":   5, "left":   5 },
		{ "id": "#relative-1-1", "top":  -1, "left":  -1 },
		{ "id": "#relative-1-1", "top":  15, "left":  15 },
		{ "id": "#relative-1",   "top": 100, "left": 100 },
		{ "id": "#relative-1",   "top":   0, "left":   0 },
		{ "id": "#relative-1",   "top":  -1, "left":  -1 },
		{ "id": "#relative-1",   "top":   7, "left":   7 }
	];
	jQuery.each( tests, function() {
		$( this[ "id" ] ).offset( { "top": this[ "top" ], "left": this[ "left" ] } );
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').offset({ top: "  + this[ "top" ]  + " })" );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').offset({ left: " + this[ "left" ] + " })" );

		$( this[ "id" ] ).offset( { "top": this[ "top" ], "left": this[ "left" ], "using": function( props ) {
			$( this ).css( {
				"top":  props.top  + 1,
				"left": props.left + 1
			} );
		} } );
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ]  + 1, "jQuery('" + this[ "id" ] + "').offset({ top: "  + ( this[ "top" ]  + 1 ) + ", using: fn })" );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ] + 1, "jQuery('" + this[ "id" ] + "').offset({ left: " + ( this[ "left" ] + 1 ) + ", using: fn })" );
	} );
} );

testIframe( "static", "offset/static.html", function( assert, $ ) {
	assert.expect( 80 );

	// get offset
	var tests = [
		{ "id": "#static-1",     "top":   7, "left":  7 },
		{ "id": "#static-1-1",   "top":  15, "left": 15 },
		{ "id": "#static-1-1-1", "top":  23, "left": 23 },
		{ "id": "#static-2",     "top": 122, left: 7 }
	];
	jQuery.each( tests, function() {
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').offset().top" );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').offset().left" );
	} );

	// get position
	tests = [
		{ "id": "#static-1",     "top":   6, "left":  6 },
		{ "id": "#static-1-1",   "top":  14, "left": 14 },
		{ "id": "#static-1-1-1", "top":  22, "left": 22 },
		{ "id": "#static-2",     "top": 121, "left": 6 }
	];
	jQuery.each( tests, function() {
		assert.equal( $( this[ "id" ] ).position().top,  this[ "top" ],  "jQuery('" + this[ "top" ]  + "').position().top" );
		assert.equal( $( this[ "id" ] ).position().left, this[ "left" ], "jQuery('" + this[ "left" ] + "').position().left" );
	} );

	// set offset
	tests = [
		{ "id": "#static-2",     "top": 200, "left": 200 },
		{ "id": "#static-2",     "top": 100, "left": 100 },
		{ "id": "#static-2",     "top":  -2, "left":  -2 },
		{ "id": "#static-2",     "top": 121, "left":   6 },
		{ "id": "#static-1-1-1", "top":  50, "left":  50 },
		{ "id": "#static-1-1-1", "top":  10, "left":  10 },
		{ "id": "#static-1-1-1", "top":  -1, "left":  -1 },
		{ "id": "#static-1-1-1", "top":  22, "left":  22 },
		{ "id": "#static-1-1",   "top":  25, "left":  25 },
		{ "id": "#static-1-1",   "top":  10, "left":  10 },
		{ "id": "#static-1-1",   "top":  -3, "left":  -3 },
		{ "id": "#static-1-1",   "top":  14, "left":  14 },
		{ "id": "#static-1",     "top":  30, "left":  30 },
		{ "id": "#static-1",     "top":   2, "left":   2 },
		{ "id": "#static-1",     "top":  -2, "left":  -2 },
		{ "id": "#static-1",     "top":   7, "left":   7 }
	];
	jQuery.each( tests, function() {
		$( this[ "id" ] ).offset( { "top": this[ "top" ], "left": this[ "left" ] } );
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').offset({ top: "  + this[ "top" ]  + " })" );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').offset({ left: " + this[ "left" ] + " })" );

		$( this[ "id" ] ).offset( { "top": this[ "top" ], "left": this[ "left" ], "using": function( props ) {
			$( this ).css( {
				"top":  props.top  + 1,
				"left": props.left + 1
			} );
		} } );
		assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ]  + 1, "jQuery('" + this[ "id" ] + "').offset({ top: "  + ( this[ "top" ]  + 1 ) + ", using: fn })" );
		assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ] + 1, "jQuery('" + this[ "id" ] + "').offset({ left: " + ( this[ "left" ] + 1 ) + ", using: fn })" );
	} );
} );

testIframe( "fixed", "offset/fixed.html", function( assert, $, window ) {
	assert.expect( 34 );

	var tests, $noTopLeft;

	tests = [
		{
			"id": "#fixed-1",
			"offsetTop": 1001,
			"offsetLeft": 1001,
			"positionTop": 0,
			"positionLeft": 0
		},
		{
			"id": "#fixed-2",
			"offsetTop": 1021,
			"offsetLeft": 1021,
			"positionTop": 20,
			"positionLeft": 20
		}
	];

	jQuery.each( tests, function() {
		if ( !window.supportsScroll ) {
			assert.ok( true, "Browser doesn't support scroll position." );
			assert.ok( true, "Browser doesn't support scroll position." );
			assert.ok( true, "Browser doesn't support scroll position." );
			assert.ok( true, "Browser doesn't support scroll position." );

		} else if ( window.supportsFixedPosition ) {
			assert.equal( $( this[ "id" ] ).offset().top,  this[ "offsetTop" ],  "jQuery('" + this[ "id" ] + "').offset().top" );
			assert.equal( $( this[ "id" ] ).position().top,  this[ "positionTop" ],  "jQuery('" + this[ "id" ] + "').position().top" );
			assert.equal( $( this[ "id" ] ).offset().left, this[ "offsetLeft" ], "jQuery('" + this[ "id" ] + "').offset().left" );
			assert.equal( $( this[ "id" ] ).position().left,  this[ "positionLeft" ],  "jQuery('" + this[ "id" ] + "').position().left" );
		} else {

			// need to have same number of assertions
			assert.ok( true, "Fixed position is not supported" );
			assert.ok( true, "Fixed position is not supported" );
			assert.ok( true, "Fixed position is not supported" );
			assert.ok( true, "Fixed position is not supported" );
		}
	} );

	tests = [
		{ "id": "#fixed-1", "top": 100, "left": 100 },
		{ "id": "#fixed-1", "top":   0, "left":   0 },
		{ "id": "#fixed-1", "top":  -4, "left":  -4 },
		{ "id": "#fixed-2", "top": 200, "left": 200 },
		{ "id": "#fixed-2", "top":   0, "left":   0 },
		{ "id": "#fixed-2", "top":  -5, "left":  -5 }
	];

	jQuery.each( tests, function() {
		if ( window.supportsFixedPosition ) {
			$( this[ "id" ] ).offset( { "top": this[ "top" ], "left": this[ "left" ] } );
			assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ],  "jQuery('" + this[ "id" ] + "').offset({ top: "  + this[ "top" ]  + " })" );
			assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ], "jQuery('" + this[ "id" ] + "').offset({ left: " + this[ "left" ] + " })" );

			$( this[ "id" ] ).offset( { "top": this[ "top" ], "left": this[ "left" ], "using": function( props ) {
				$( this ).css( {
					"top":  props.top  + 1,
					"left": props.left + 1
				} );
			} } );
			assert.equal( $( this[ "id" ] ).offset().top,  this[ "top" ]  + 1, "jQuery('" + this[ "id" ] + "').offset({ top: "  + ( this[ "top" ]  + 1 ) + ", using: fn })" );
			assert.equal( $( this[ "id" ] ).offset().left, this[ "left" ] + 1, "jQuery('" + this[ "id" ] + "').offset({ left: " + ( this[ "left" ] + 1 ) + ", using: fn })" );
		} else {

			// need to have same number of assertions
			assert.ok( true, "Fixed position is not supported" );
			assert.ok( true, "Fixed position is not supported" );
			assert.ok( true, "Fixed position is not supported" );
			assert.ok( true, "Fixed position is not supported" );
		}
	} );

	// Bug 8316
	$noTopLeft = $( "#fixed-no-top-left" );
	if ( window.supportsFixedPosition ) {
		assert.equal( $noTopLeft.offset().top,  1007,  "Check offset top for fixed element with no top set" );
		assert.equal( $noTopLeft.offset().left, 1007, "Check offset left for fixed element with no left set" );
	} else {

		// need to have same number of assertions
		assert.ok( true, "Fixed position is not supported" );
		assert.ok( true, "Fixed position is not supported" );
	}
} );

testIframe( "table", "offset/table.html", function( assert, $ ) {
	assert.expect( 4 );

	assert.equal( $( "#table-1" ).offset().top, 6, "jQuery('#table-1').offset().top" );
	assert.equal( $( "#table-1" ).offset().left, 6, "jQuery('#table-1').offset().left" );

	assert.equal( $( "#th-1" ).offset().top, 10, "jQuery('#th-1').offset().top" );
	assert.equal( $( "#th-1" ).offset().left, 10, "jQuery('#th-1').offset().left" );
} );

testIframe( "scroll", "offset/scroll.html", function( assert, $, win ) {
	assert.expect( 26 );

	assert.equal( $( "#scroll-1" ).offset().top, 7, "jQuery('#scroll-1').offset().top" );
	assert.equal( $( "#scroll-1" ).offset().left, 7, "jQuery('#scroll-1').offset().left" );

	assert.equal( $( "#scroll-1-1" ).offset().top, 11, "jQuery('#scroll-1-1').offset().top" );
	assert.equal( $( "#scroll-1-1" ).offset().left, 11, "jQuery('#scroll-1-1').offset().left" );

	// These tests are solely for master/compat consistency
	// Retrieving offset on disconnected/hidden elements is not officially
	// valid input, but will return zeros for back-compat
	assert.equal( $( "#hidden" ).offset().top, 0, "Hidden elements do not subtract scroll" );
	assert.equal( $( "#hidden" ).offset().left, 0, "Hidden elements do not subtract scroll" );

	// scroll offset tests .scrollTop/Left
	assert.equal( $( "#scroll-1" ).scrollTop(), 5, "jQuery('#scroll-1').scrollTop()" );
	assert.equal( $( "#scroll-1" ).scrollLeft(), 5, "jQuery('#scroll-1').scrollLeft()" );

	assert.equal( $( "#scroll-1-1" ).scrollTop(), 0, "jQuery('#scroll-1-1').scrollTop()" );
	assert.equal( $( "#scroll-1-1" ).scrollLeft(), 0, "jQuery('#scroll-1-1').scrollLeft()" );

	// scroll method chaining
	assert.equal( $( "#scroll-1" ).scrollTop( undefined ).scrollTop(), 5, ".scrollTop(undefined) is chainable (#5571)" );
	assert.equal( $( "#scroll-1" ).scrollLeft( undefined ).scrollLeft(), 5, ".scrollLeft(undefined) is chainable (#5571)" );

	win.name = "test";

	if ( !window.supportsScroll ) {
		assert.ok( true, "Browser doesn't support scroll position." );
		assert.ok( true, "Browser doesn't support scroll position." );

		assert.ok( true, "Browser doesn't support scroll position." );
		assert.ok( true, "Browser doesn't support scroll position." );
	} else {
		assert.equal( $( win ).scrollTop(), 1000, "jQuery(window).scrollTop()" );
		assert.equal( $( win ).scrollLeft(), 1000, "jQuery(window).scrollLeft()" );

		assert.equal( $( win.document ).scrollTop(), 1000, "jQuery(document).scrollTop()" );
		assert.equal( $( win.document ).scrollLeft(), 1000, "jQuery(document).scrollLeft()" );
	}

	// test jQuery using parent window/document
	// jQuery reference here is in the iframe
	window.scrollTo( 0, 0 );
	assert.equal( $( window ).scrollTop(), 0, "jQuery(window).scrollTop() other window" );
	assert.equal( $( window ).scrollLeft(), 0, "jQuery(window).scrollLeft() other window" );
	assert.equal( $( document ).scrollTop(), 0, "jQuery(window).scrollTop() other document" );
	assert.equal( $( document ).scrollLeft(), 0, "jQuery(window).scrollLeft() other document" );

	// Tests scrollTop/Left with empty jquery objects
	assert.notEqual( $().scrollTop( 100 ), null, "jQuery().scrollTop(100) testing setter on empty jquery object" );
	assert.notEqual( $().scrollLeft( 100 ), null, "jQuery().scrollLeft(100) testing setter on empty jquery object" );
	assert.notEqual( $().scrollTop( null ), null, "jQuery().scrollTop(null) testing setter on empty jquery object" );
	assert.notEqual( $().scrollLeft( null ), null, "jQuery().scrollLeft(null) testing setter on empty jquery object" );
	assert.strictEqual( $().scrollTop(), undefined, "jQuery().scrollTop() testing getter on empty jquery object" );
	assert.strictEqual( $().scrollLeft(), undefined, "jQuery().scrollLeft() testing getter on empty jquery object" );
} );

testIframe( "body", "offset/body.html", function( assert, $ ) {
	assert.expect( 4 );

	assert.equal( $( "body" ).offset().top, 1, "jQuery('#body').offset().top" );
	assert.equal( $( "body" ).offset().left, 1, "jQuery('#body').offset().left" );
	assert.equal( $( "#firstElement" ).position().left, 5, "$('#firstElement').position().left" );
	assert.equal( $( "#firstElement" ).position().top, 5, "$('#firstElement').position().top" );
} );

QUnit.test( "chaining", function( assert ) {
	assert.expect( 3 );

	var coords = { "top":  1, "left":  1 };
	assert.equal( jQuery( "#absolute-1" ).offset( coords ).jquery, jQuery.fn.jquery, "offset(coords) returns jQuery object" );
	assert.equal( jQuery( "#non-existent" ).offset( coords ).jquery, jQuery.fn.jquery, "offset(coords) with empty jQuery set returns jQuery object" );
	assert.equal( jQuery( "#absolute-1" ).offset( undefined ).jquery, jQuery.fn.jquery, "offset(undefined) returns jQuery object (#5571)" );
} );

QUnit.test( "offsetParent", function( assert ) {
	assert.expect( 13 );

	var body, header, div, area;

	body = jQuery( "body" ).offsetParent();
	assert.equal( body.length, 1, "Only one offsetParent found." );
	assert.equal( body[ 0 ], document.documentElement, "The html element is the offsetParent of the body." );

	header = jQuery( "#qunit" ).offsetParent();
	assert.equal( header.length, 1, "Only one offsetParent found." );
	assert.equal( header[ 0 ], document.documentElement, "The html element is the offsetParent of #qunit." );

	div = jQuery( "#nothiddendivchild" ).offsetParent();
	assert.equal( div.length, 1, "Only one offsetParent found." );
	assert.equal( div[ 0 ], document.getElementById( "qunit-fixture" ), "The #qunit-fixture is the offsetParent of #nothiddendivchild." );

	jQuery( "#nothiddendiv" ).css( "position", "relative" );

	div = jQuery( "#nothiddendivchild" ).offsetParent();
	assert.equal( div.length, 1, "Only one offsetParent found." );
	assert.equal( div[ 0 ], jQuery( "#nothiddendiv" )[ 0 ], "The div is the offsetParent." );

	div = jQuery( "body, #nothiddendivchild" ).offsetParent();
	assert.equal( div.length, 2, "Two offsetParent found." );
	assert.equal( div[ 0 ], document.documentElement, "The html element is the offsetParent of the body." );
	assert.equal( div[ 1 ], jQuery( "#nothiddendiv" )[ 0 ], "The div is the offsetParent." );

	area = jQuery( "#imgmap area" ).offsetParent();
	assert.equal( area[ 0 ], document.documentElement, "The html element is the offsetParent of the body." );

	div = jQuery( "<div>" ).css( { "position": "absolute" } ).appendTo( "body" );
	assert.equal( div.offsetParent()[ 0 ], document.documentElement, "Absolutely positioned div returns html as offset parent, see #12139" );

	div.remove();
} );

QUnit.test( "fractions (see #7730 and #7885)", function( assert ) {
	assert.expect( 2 );

	jQuery( "body" ).append( "<div id='fractions'/>" );

	var result,
		expected = { "top": 1000, "left": 1000 },
		div = jQuery( "#fractions" );

	div.css( {
		"position": "absolute",
		"left": "1000.7432222px",
		"top": "1000.532325px",
		"width": 100,
		"height": 100
	} );

	div.offset( expected );

	result = div.offset();

	// Support: Chrome <=45 - 46
	// In recent Chrome these values differ a little.
	assert.ok( Math.abs( result.top - expected.top ) < 0.25, "Check top within 0.25 of expected" );
	assert.equal( result.left, expected.left, "Check left" );

	div.remove();
} );

QUnit.test( "iframe scrollTop/Left (see gh-1945)", function( assert ) {
	assert.expect( 2 );

	var ifDoc = jQuery( "#iframe" )[ 0 ].contentDocument;

	// Mobile Safari resize the iframe by its content meaning it's not possible to scroll
	// the iframe but only its parent element.
	// It seems (not confirmed) in android 4.0 it's not possible to scroll iframes from the code.
	if ( /iphone os/i.test( navigator.userAgent ) ||
	    /android 4\.0/i.test( navigator.userAgent ) ) {
		assert.equal( true, true, "Can't scroll iframes in this environment" );
		assert.equal( true, true, "Can't scroll iframes in this environment" );

	} else {

		// Tests scrollTop/Left with iframes
		jQuery( "#iframe" ).css( "width", "50px" ).css( "height", "50px" );
		ifDoc.write( "<div style='width: 1000px; height: 1000px;'></div>" );

		jQuery( ifDoc ).scrollTop( 200 );
		jQuery( ifDoc ).scrollLeft( 500 );

		assert.equal( jQuery( ifDoc ).scrollTop(), 200, "$($('#iframe')[0].contentDocument).scrollTop()" );
		assert.equal( jQuery( ifDoc ).scrollLeft(), 500, "$($('#iframe')[0].contentDocument).scrollLeft()" );
	}
} );

} )();