Docs:Tests: Remove legacy code & add support comments where needed

This commits backports some changes done in the patch to the then-existing
compat branch that removed support for old browsers and added some support
comments.

Refs 90d7cc1d8b2ea7ac75f0eacb42439349c9c73278

6 files changed, 38 insertions, 55 deletions

diff --git a/src/attributes/val.js b/src/attributes/val.js
index a8a2e12fb..1338fcdf6 100644
--- a/src/attributes/val.js
+++ b/src/attributes/val.js
@@ -108,6 +108,7 @@ jQuery.extend( {
 				for ( ; i < max; i++ ) {
 					option = options[ i ];
 
+					// Support: IE <=9 only
 					// IE8-9 doesn't update selected after form reset (#2551)
 					if ( ( option.selected || i === index ) &&
 
diff --git a/test/data/css/cssWidthBeforeDocReady.html b/test/data/css/cssWidthBeforeDocReady.html
index 12e954dc0..a8fa4af0f 100644
--- a/test/data/css/cssWidthBeforeDocReady.html
+++ b/test/data/css/cssWidthBeforeDocReady.html
@@ -4,7 +4,6 @@
 	<meta charset="utf-8">
 	<style>
 		#test {
-			-webkit-box-sizing: border-box;
 			box-sizing: border-box;
 			width: 100px;
 			height: 100px;
diff --git a/test/unit/css.js b/test/unit/css.js
index 43ce6ae19..c82d8c203 100644
--- a/test/unit/css.js
+++ b/test/unit/css.js
@@ -58,9 +58,9 @@ QUnit.test( "css(String|Hash)", function( assert ) {
 	jQuery( "#foo" ).css( { "opacity": "" } );
 	assert.equal( jQuery( "#foo" ).css( "opacity" ), "1", "Assert opacity is 1 when set to an empty String" );
 
-	assert.equal( jQuery( "#empty" ).css( "opacity" ), "0", "Assert opacity is accessible via filter property set in stylesheet in IE" );
+	assert.equal( jQuery( "#empty" ).css( "opacity" ), "0", "Assert opacity is accessible" );
 	jQuery( "#empty" ).css( { "opacity": "1" } );
-	assert.equal( jQuery( "#empty" ).css( "opacity" ), "1", "Assert opacity is taken from style attribute when set vs stylesheet in IE with filters" );
+	assert.equal( jQuery( "#empty" ).css( "opacity" ), "1", "Assert opacity is taken from style attribute when set" );
 
 	div = jQuery( "#nothiddendiv" );
 	child = jQuery( "#nothiddendivchild" );
@@ -478,7 +478,7 @@ QUnit.test( "show()", function( assert ) {
 
 	assert.expect( 18 );
 
-	var hiddendiv, div, pass, old, test;
+	var hiddendiv, div, pass, test;
 		hiddendiv = jQuery( "div.hidden" );
 
 	assert.equal( jQuery.css( hiddendiv[ 0 ], "display" ), "none", "hiddendiv is display: none" );
@@ -504,13 +504,9 @@ QUnit.test( "show()", function( assert ) {
 		"<div id='show-tests'>" +
 		"<div><p><a href='#'></a></p><code></code><pre></pre><span></span></div>" +
 		"<table><thead><tr><th></th></tr></thead><tbody><tr><td></td></tr></tbody></table>" +
-		"<ul><li></li></ul></div>" +
-		"<table id='test-table'></table>"
+		"<ul><li></li></ul></div>"
 	).appendTo( "#qunit-fixture" ).find( "*" ).css( "display", "none" );
 
-	old = jQuery( "#test-table" ).show().css( "display" ) !== "table";
-	jQuery( "#test-table" ).remove();
-
 	test = {
 		"div": "block",
 		"p": "block",
@@ -518,14 +514,14 @@ QUnit.test( "show()", function( assert ) {
 		"code": "inline",
 		"pre": "block",
 		"span": "inline",
-		"table": old ? "block" : "table",
-		"thead": old ? "block" : "table-header-group",
-		"tbody": old ? "block" : "table-row-group",
-		"tr": old ? "block" : "table-row",
-		"th": old ? "block" : "table-cell",
-		"td": old ? "block" : "table-cell",
+		"table": "table",
+		"thead": "table-header-group",
+		"tbody": "table-row-group",
+		"tr": "table-row",
+		"th": "table-cell",
+		"td": "table-cell",
 		"ul": "block",
-		"li": old ? "block" : "list-item"
+		"li": "list-item"
 	};
 
 	jQuery.each( test, function( selector, expected ) {
@@ -1234,23 +1230,21 @@ QUnit.test( "cssHooks - expand", function( assert ) {
 } );
 
 QUnit.test( "css opacity consistency across browsers (#12685)", function( assert ) {
-	assert.expect( 4 );
+	assert.expect( 3 );
 
 	var el,
 		fixture = jQuery( "#qunit-fixture" );
 
 	// Append style element
-	jQuery( "<style>.opacityWithSpaces_t12685 { opacity: 0.1; filter: alpha(opacity = 10); } .opacityNoSpaces_t12685 { opacity: 0.2; filter: alpha(opacity=20); }</style>" ).appendTo( fixture );
+	jQuery( "<style>.opacity_t12685 { opacity: 0.1; }</style>" ).appendTo( fixture );
 
-	el = jQuery( "<div class='opacityWithSpaces_t12685'></div>" ).appendTo( fixture );
+	el = jQuery( "<div class='opacity_t12685'></div>" ).appendTo( fixture );
 
-	assert.equal( Math.round( el.css( "opacity" ) * 100 ), 10, "opacity from style sheet (filter:alpha with spaces)" );
-	el.removeClass( "opacityWithSpaces_t12685" ).addClass( "opacityNoSpaces_t12685" );
-	assert.equal( Math.round( el.css( "opacity" ) * 100 ), 20, "opacity from style sheet (filter:alpha without spaces)" );
+	assert.equal( Math.round( el.css( "opacity" ) * 100 ), 10, "opacity from style sheet" );
 	el.css( "opacity", 0.3 );
 	assert.equal( Math.round( el.css( "opacity" ) * 100 ), 30, "override opacity" );
 	el.css( "opacity", "" );
-	assert.equal( Math.round( el.css( "opacity" ) * 100 ), 20, "remove opacity override" );
+	assert.equal( Math.round( el.css( "opacity" ) * 100 ), 10, "remove opacity override" );
 } );
 
 QUnit[ jQuery.find.compile ? "test" : "skip" ]( ":visible/:hidden selectors", function( assert ) {
diff --git a/test/unit/effects.js b/test/unit/effects.js
index 2f0ac9334..653db6431 100644
--- a/test/unit/effects.js
+++ b/test/unit/effects.js
@@ -50,7 +50,7 @@ QUnit.test( "show() basic", function( assert ) {
 QUnit.test( "show()", function( assert ) {
 	assert.expect( 27 );
 
-	var div, speeds, old, test,
+	var div, speeds, test,
 		hiddendiv = jQuery( "div.hidden" );
 
 	assert.equal( jQuery.css( hiddendiv[ 0 ], "display" ), "none", "hiddendiv is display: none" );
@@ -99,13 +99,9 @@ QUnit.test( "show()", function( assert ) {
 		"<div id='show-tests'>" +
 		"<div><p><a href='#'></a></p><code></code><pre></pre><span></span></div>" +
 		"<table><thead><tr><th></th></tr></thead><tbody><tr><td></td></tr></tbody></table>" +
-		"<ul><li></li></ul></div>" +
-		"<table id='test-table'></table>"
+		"<ul><li></li></ul></div>"
 	).appendTo( "#qunit-fixture" ).find( "*" ).css( "display", "none" );
 
-	old = jQuery( "#test-table" ).show().css( "display" ) !== "table";
-	jQuery( "#test-table" ).remove();
-
 	test = {
 		"div": "block",
 		"p": "block",
@@ -113,14 +109,14 @@ QUnit.test( "show()", function( assert ) {
 		"code": "inline",
 		"pre": "block",
 		"span": "inline",
-		"table": old ? "block" : "table",
-		"thead": old ? "block" : "table-header-group",
-		"tbody": old ? "block" : "table-row-group",
-		"tr": old ? "block" : "table-row",
-		"th": old ? "block" : "table-cell",
-		"td": old ? "block" : "table-cell",
+		"table": "table",
+		"thead": "table-header-group",
+		"tbody": "table-row-group",
+		"tr": "table-row",
+		"th": "table-cell",
+		"td": "table-cell",
 		"ul": "block",
-		"li": old ? "block" : "list-item"
+		"li": "list-item"
 	};
 
 	jQuery.each( test, function( selector, expected ) {
@@ -144,34 +140,28 @@ supportjQuery.each( hideOptions, function( type, setup ) {
 			"<div><p><a href='#'></a></p><code></code><pre></pre><span></span></div>" +
 			"<table><thead><tr><th></th></tr></thead><tbody><tr><td></td></tr></tbody>" +
 				"</table>" +
-			"<ul><li></li></ul></div>" +
-			"<table id='test-table'></table>"
+			"<ul><li></li></ul></div>"
 		).appendTo( "#qunit-fixture" ).find( "*" ).each( setup );
 
-		var test,
-			old = jQuery( "#test-table" ).show().css( "display" ) !== "table";
-
-		jQuery( "#test-table" ).remove();
-
 		// Note: inline elements are expected to be inline-block
 		// because we're showing width/height
 		// Can't animate width/height inline
 		// See #14344
-		test = {
+		var test = {
 			"div": "block",
 			"p": "block",
 			"a": "inline",
 			"code": "inline",
 			"pre": "block",
 			"span": "inline",
-			"table": old ? "block" : "table",
-			"thead": old ? "block" : "table-header-group",
-			"tbody": old ? "block" : "table-row-group",
-			"tr": old ? "block" : "table-row",
-			"th": old ? "block" : "table-cell",
-			"td": old ? "block" : "table-cell",
+			"table": "table",
+			"thead": "table-header-group",
+			"tbody": "table-row-group",
+			"tr": "table-row",
+			"th": "table-cell",
+			"td": "table-cell",
 			"ul": "block",
-			"li": old ? "block" : "list-item"
+			"li": "list-item"
 		};
 
 		jQuery.each( test, function( selector ) {
@@ -369,10 +359,8 @@ QUnit.test( "animate block width/height", function( assert ) {
 QUnit.test( "animate table width/height", function( assert ) {
 	assert.expect( 1 );
 
-	var displayMode = jQuery( "#table" ).css( "display" ) !== "table" ? "block" : "table";
-
 	jQuery( "#table" ).animate( { width: 42, height: 42 }, 100, function() {
-		assert.equal( jQuery( this ).css( "display" ), displayMode, "display mode is correct" );
+		assert.equal( jQuery( this ).css( "display" ), "table", "display mode is correct" );
 	} );
 	this.clock.tick( 100 );
 } );
diff --git a/test/unit/event.js b/test/unit/event.js
index 63b367ea8..33393c835 100644
--- a/test/unit/event.js
+++ b/test/unit/event.js
@@ -2920,6 +2920,7 @@ if ( !( /firefox/i.test( window.navigator.userAgent ) ) ) {
 			$text = jQuery( "#text1" ),
 			$radio = jQuery( "#radio1" ).trigger( "focus" );
 
+		// Support: IE <=10 only
 		// IE8-10 fire focus/blur events asynchronously; this is the resulting mess.
 		// IE's browser window must be topmost for this to work properly!!
 		QUnit.stop();
diff --git a/test/unit/wrap.js b/test/unit/wrap.js
index 80abd9e87..02994bafa 100644
--- a/test/unit/wrap.js
+++ b/test/unit/wrap.js
@@ -60,7 +60,7 @@ function testWrap( val, assert ) {
 	j.wrap( val( "<i></i>" ) );
 
 	assert.equal(
-		jQuery( "#nonnodes > i" ).length, jQuery( "#nonnodes" )[ 0 ].childNodes.length,
+		jQuery( "#nonnodes > i" ).length, 3,
 		"Check node,textnode,comment wraps ok"
 	);
 	assert.equal(