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 } );

/*
	Closure-compiler will roll static methods off of the jQuery object and so they will
	not be passed with the jQuery object across the windows. To differentiate this, the
	testIframe callbacks use the "$" symbol to refer to the jQuery object passed from
	the iframe window and the "jQuery" symbol is used to access any static methods.
*/

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( "object without getBoundingClientRect", function( assert ) {
	assert.expect( 2 );

	// Simulates a browser without gBCR on elements, we just want to return 0,0
	var result = jQuery({ ownerDocument: document }).offset();
	assert.equal( result.top, 0, "Check top" );
	assert.equal( result.left, 0, "Check left" );
});

QUnit.test( "disconnected node", 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
	equal( result.top, 0, "Check top" );
	equal( result.left, 0, "Check left" );
} );

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( "offset/absolute", "absolute", function( $, iframe, document, assert ) {
	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( "offset/absolute", "absolute", function( $, window, document, 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( "offset/relative", "relative", function( $, window, document, 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( "offset/static", "static", function( $, window, document, 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( "offset/fixed", "fixed", function( $, window, document, assert ) {
	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( "offset/table", "table", function( $, window, document, 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( "offset/scroll", "scroll", function( $, win, doc, assert ) {
	assert.expect( 30 );

	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" );

	// Tests position after parent scrolling (#15239)
	$( "#scroll-1" ).scrollTop( 0 );
	$( "#scroll-1" ).scrollLeft( 0 );
	assert.equal( $( "#scroll-1-1" ).position().top, 6, "jQuery('#scroll-1-1').position().top unaffected by parent scrolling" );
	assert.equal( $( "#scroll-1-1" ).position().left, 6, "jQuery('#scroll-1-1').position().left unaffected by parent scrolling" );

	$( "#scroll-1" ).scrollTop( 5 );
	$( "#scroll-1" ).scrollLeft( 5 );
	assert.equal( $( "#scroll-1-1" ).position().top, 6, "jQuery('#scroll-1-1').position().top unaffected by parent scrolling" );
	assert.equal( $( "#scroll-1-1" ).position().left, 6, "jQuery('#scroll-1-1').position().left unaffected by parent scrolling" );
} );

testIframe( "offset/body", "body", function( $, window, document, 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 and Android 2.3 resize the iframe by its content
	// meaning it's not possible to scroll the iframe 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 2\.3/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()" );
	}
} );

} )();