Fix #10814. Make support tests lazy and broken out to components.

18 files changed, 246 insertions, 184 deletions

diff --git a/src/ajax/xhr.js b/src/ajax/xhr.js
index fdc5b08d3..e08cfcac3 100644
--- a/src/ajax/xhr.js
+++ b/src/ajax/xhr.js
@@ -1,8 +1,8 @@
 define([
 	"../core",
-	"../ajax",
-	"../support"
-], function( jQuery ) {
+	"../var/support",
+	"../ajax"
+], function( jQuery, support ) {
 
 jQuery.ajaxSettings.xhr = function() {
 	try {
@@ -33,13 +33,13 @@ if ( window.ActiveXObject ) {
 	});
 }
 
-jQuery.support.cors = !!xhrSupported && ( "withCredentials" in xhrSupported );
-jQuery.support.ajax = xhrSupported = !!xhrSupported;
+support.cors = !!xhrSupported && ( "withCredentials" in xhrSupported );
+support.ajax = xhrSupported = !!xhrSupported;
 
 jQuery.ajaxTransport(function( options ) {
 	var callback;
 	// Cross domain only allowed if supported through XMLHttpRequest
-	if ( jQuery.support.cors || xhrSupported && !options.crossDomain ) {
+	if ( support.cors || xhrSupported && !options.crossDomain ) {
 		return {
 			send: function( headers, complete ) {
 				var i, id,
diff --git a/src/attributes/attr.js b/src/attributes/attr.js
index 170e6a39e..e47bde2f3 100644
--- a/src/attributes/attr.js
+++ b/src/attributes/attr.js
@@ -2,9 +2,9 @@ define([
 	"../core",
 	"../var/rnotwhite",
 	"../var/strundefined",
-	"../selector",
-	"../support"
-], function( jQuery, rnotwhite, strundefined ) {
+	"./support",
+	"../selector"
+], function( jQuery, rnotwhite, strundefined, support ) {
 
 var nodeHook, boolHook,
 	attrHandle = jQuery.expr.attrHandle;
@@ -93,7 +93,8 @@ jQuery.extend({
 	attrHooks: {
 		type: {
 			set: function( elem, value ) {
-				if ( !jQuery.support.radioValue && value === "radio" && jQuery.nodeName(elem, "input") ) {
+				if ( !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;
diff --git a/src/attributes/prop.js b/src/attributes/prop.js
index 95462bbbb..f321b1ef7 100644
--- a/src/attributes/prop.js
+++ b/src/attributes/prop.js
@@ -1,7 +1,7 @@
 define([
 	"../core",
-	"../support"
-], function( jQuery ) {
+	"./support"
+], function( jQuery, support ) {
 
 var rfocusable = /^(?:input|select|textarea|button)$/i;
 
@@ -65,7 +65,7 @@ jQuery.extend({
 
 // Support: IE9+
 // Selectedness for an option in an optgroup can be inaccurate
-if ( !jQuery.support.optSelected ) {
+if ( !support.optSelected ) {
 	jQuery.propHooks.selected = {
 		get: function( elem ) {
 			var parent = elem.parentNode;
diff --git a/src/attributes/support.js b/src/attributes/support.js
new file mode 100644
index 000000000..aa9adf265
--- /dev/null
+++ b/src/attributes/support.js
@@ -0,0 +1,35 @@
+define([
+	"../var/support"
+], function( support ) {
+
+(function () {
+	var input = document.createElement( "input" ),
+		select = document.createElement( "select" ),
+		opt = select.appendChild( document.createElement( "option" ) );
+
+	input.type = "checkbox";
+
+	// Support: Safari 5.1, iOS 5.1, Android 4.x, Android 2.3
+	// Check the default checkbox/radio value ("" on old WebKit; "on" elsewhere)
+	support.checkOn = input.value !== "";
+
+	// Must access the parent to make an option select properly
+	// Support: IE9, IE10
+	support.optSelected = opt.selected;
+
+	// 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;
+
+	// Check if an input maintains its value after becoming a radio
+	// Support: IE9, IE10
+	input = document.createElement( "input" );
+	input.value = "t";
+	input.type = "radio";
+	support.radioValue = input.value === "t";
+})();
+
+return support;
+
+});
diff --git a/src/attributes/val.js b/src/attributes/val.js
index 73a3bf3ea..74d8c9c46 100644
--- a/src/attributes/val.js
+++ b/src/attributes/val.js
@@ -1,7 +1,7 @@
 define([
 	"../core",
-	"../support"
-], function( jQuery ) {
+	"./support"
+], function( jQuery, support ) {
 
 var rreturn = /\r/g;
 
@@ -95,7 +95,7 @@ jQuery.extend({
 					// IE6-9 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 ) &&
+							( support.optDisabled ? !option.disabled : option.getAttribute( "disabled" ) === null ) &&
 							( !option.parentNode.disabled || !jQuery.nodeName( option.parentNode, "optgroup" ) ) ) {
 
 						// Get the specific value for the option
@@ -146,7 +146,7 @@ jQuery.each([ "radio", "checkbox" ], function() {
 			}
 		}
 	};
-	if ( !jQuery.support.checkOn ) {
+	if ( support.checkOn ) {
 		jQuery.valHooks[ this ].get = function( elem ) {
 			// Support: Webkit
 			// "" is returned instead of "on" if a value isn't specified
diff --git a/src/core.js b/src/core.js
index 0eef72311..4103b3832 100644
--- a/src/core.js
+++ b/src/core.js
@@ -9,9 +9,10 @@ define([
 	"./var/class2type",
 	"./var/toString",
 	"./var/hasOwn",
-	"./var/trim"
+	"./var/trim",
+	"./var/support"
 ], function( strundefined, arr, slice, concat, push, indexOf,
-	class2type, toString, hasOwn, trim ) {
+	class2type, toString, hasOwn, trim, support ) {
 
 var
 	// A central reference to the root jQuery(document)
@@ -702,7 +703,11 @@ jQuery.extend({
 				length ? fn( elems[0], key ) : emptyGet;
 	},
 
-	now: Date.now
+	now: Date.now,
+
+	// jQuery.support is not used in Core but other projects attach their
+	// properties to it so it needs to exist.
+	support: support
 });
 
 // Populate the class2type map
diff --git a/src/css.js b/src/css.js
index 4ac7dfbce..fc59205b1 100644
--- a/src/css.js
+++ b/src/css.js
@@ -3,15 +3,15 @@ define([
 	"./var/pnum",
 	"./css/var/cssExpand",
 	"./css/var/isHidden",
+	"./css/support",
 	"./css/defaultDisplay",
 	"./data/var/data_priv",
-	"./core/swap",
+	"./css/swap",
 	"./core/ready",
 	"./selector", // contains
-	"./support",
 	// Optional
 	"./offset"
-], function( jQuery, pnum, cssExpand, isHidden, defaultDisplay, data_priv ) {
+], function( jQuery, pnum, cssExpand, isHidden, support, defaultDisplay, data_priv ) {
 var curCSS,
 	// 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
@@ -233,7 +233,7 @@ jQuery.extend({
 
 			// Fixes #8908, it can be done more correctly by specifying 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 ) {
+			if ( !support.clearCloneStyle && value === "" && name.indexOf( "background" ) === 0 ) {
 				style[ name ] = "inherit";
 			}
 
@@ -382,7 +382,7 @@ function getWidthOrHeight( elem, name, extra ) {
 	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";
+		isBorderBox = 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/show_bug.cgi?id=649285
@@ -401,7 +401,8 @@ function getWidthOrHeight( elem, name, extra ) {
 
 		// 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 ] );
+		valueIsBorderBox = isBorderBox &&
+			( support.boxSizingReliable() || val === elem.style[ name ] );
 
 		// Normalize "", auto, and prepare for extra
 		val = parseFloat( val ) || 0;
@@ -440,7 +441,7 @@ jQuery.each([ "height", "width" ], function( i, name ) {
 					elem,
 					name,
 					extra,
-					jQuery.support.boxSizing && jQuery.css( elem, "boxSizing", false, styles ) === "border-box",
+					jQuery.css( elem, "boxSizing", false, styles ) === "border-box",
 					styles
 				) : 0
 			);
@@ -448,42 +449,49 @@ jQuery.each([ "height", "width" ], function( i, name ) {
 	};
 });
 
-// These hooks cannot be added until DOM ready because the support test
-// for it is not run until after DOM ready
-jQuery(function() {
-	// Support: Android 2.3
-	if ( !jQuery.support.reliableMarginRight ) {
-		jQuery.cssHooks.marginRight = {
-			get: function( elem, computed ) {
-				if ( computed ) {
-					// Support: Android 2.3
-					// 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" ] );
-				}
-			}
-		};
+// Support: Android 2.3
+jQuery.cssHooks.marginRight = {
+	get: function( elem, computed ) {
+		if ( support.reliableMarginRight() ) {
+			// Hook not needed, remove it.
+			// Since there are no other hooks for marginRight, remove the whole object.
+			delete jQuery.cssHooks.marginRight;
+			return;
+		}
+		if ( computed ) {
+			// Support: Android 2.3
+			// 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;
-					}
+// 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
+jQuery.each( [ "top", "left" ], function( i, prop ) {
+	jQuery.cssHooks[ prop ] = {
+		get: function( elem, computed ) {
+			if ( support.pixelPosition() || !jQuery.fn.position ) {
+				// Hook not needed, remove it.
+				// Since there are no other hooks for prop, remove the whole object.
+				delete jQuery.cssHooks[ prop ];
+				return;
+			}
+			jQuery.cssHooks[ prop ].get = function ( i, prop ) {
+				if ( computed ) {
+					computed = curCSS( elem, prop );
+					// if curCSS returns percentage, fallback to offset
+					return rnumnonpx.test( computed ) ?
+						jQuery( elem ).position()[ prop ] + "px" :
+						computed;
 				}
 			};
-		});
-	}
+			return jQuery.cssHooks[ prop ].get( i, prop );
+		}
+	};
 });
 
 // These hooks are used by animate to expand properties
diff --git a/src/css/hidden-visible-selectors.js b/src/css/hiddenVisibleSelectors.js
index c7f1c7ee7..c7f1c7ee7 100644
--- a/src/css/hidden-visible-selectors.js
+++ b/src/css/hiddenVisibleSelectors.js
diff --git a/src/css/support.js b/src/css/support.js
new file mode 100644
index 000000000..6ddf6c1a8
--- /dev/null
+++ b/src/css/support.js
@@ -0,0 +1,82 @@
+define([
+	"../var/support"
+], function( support ) {
+
+(function () {
+	var pixelPositionVal, boxSizingReliableVal,
+		// Support: Firefox, Android 2.3 (Prefixed box-sizing versions).
+		divReset = "padding:0;margin:0;border:0;display:block;-webkit-box-sizing:content-box;" +
+			"-moz-box-sizing:content-box;box-sizing:content-box",
+		docElem = document.documentElement,
+		container = document.createElement( "div" ),
+		div = document.createElement( "div" );
+
+	div.style.backgroundClip = "content-box";
+	div.cloneNode( true ).style.backgroundClip = "";
+	support.clearCloneStyle = div.style.backgroundClip === "content-box";
+
+	container.style.cssText = "border:0;width:0;height:0;position:absolute;top:0;left:-9999px;" +
+		"margin-top:1px";
+	container.appendChild( div );
+
+	// Executing both pixelPosition & boxSizingReliable tests require only one layout
+	// so they're executed at the same time to save the second computation.
+	function computePixelPositionAndBoxSizingReliable() {
+		// Support: Firefox, Android 2.3 (Prefixed box-sizing versions).
+		div.style.cssText = "-webkit-box-sizing:border-box;-moz-box-sizing:border-box;" +
+			"box-sizing:border-box;padding:1px;border:1px;display:block;width:4px;margin-top:1%;" +
+			"position:absolute;top:1%";
+		docElem.appendChild( container );
+
+		var divStyle = window.getComputedStyle( div, null );
+		pixelPositionVal = divStyle.top !== "1%";
+		boxSizingReliableVal = divStyle.width === "4px";
+
+		docElem.removeChild( container );
+	}
+
+	// Use window.getComputedStyle because jsdom on node.js will break without it.
+	if ( window.getComputedStyle ) {
+		jQuery.extend(support, {
+			pixelPosition: function() {
+				// This test is executed only once but we still do memoizing
+				// since we can use the boxSizingReliable pre-computing.
+				// No need to check if the test was already performed, though.
+				computePixelPositionAndBoxSizingReliable();
+				return pixelPositionVal;
+			},
+			boxSizingReliable: function() {
+				if ( boxSizingReliableVal == null ) {
+					computePixelPositionAndBoxSizingReliable();
+				}
+				return boxSizingReliableVal;
+			},
+			reliableMarginRight: function() {
+				// Support: Android 2.3
+				// Check if div with explicit width and no margin-right incorrectly
+				// gets computed margin-right based on width of container. (#3333)
+				// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
+				// This support function is only executed once so no memoizing is needed.
+				var ret,
+					marginDiv = div.appendChild( document.createElement( "div" ) );
+				marginDiv.style.cssText = div.style.cssText = divReset;
+				marginDiv.style.marginRight = marginDiv.style.width = "0";
+				div.style.width = "1px";
+				docElem.appendChild( container );
+
+				ret = !parseFloat( window.getComputedStyle( marginDiv, null ).marginRight );
+
+				docElem.removeChild( container );
+
+				// Clean up the div for other support tests.
+				div.innerHTML = "";
+
+				return ret;
+			}
+		});
+	}
+})();
+
+return support;
+
+});
diff --git a/src/core/swap.js b/src/css/swap.js
index 95f4e2c69..07a661c03 100644
--- a/src/core/swap.js
+++ b/src/css/swap.js
@@ -3,8 +3,6 @@ define([
 ], function( jQuery ) {
 
 	// A method for quickly swapping in/out CSS properties to get correct calculations.
-	// Note: this method belongs to the css module but it's needed here for the support module.
-	// If support gets modularized, this method should be moved back to the css module.
 	jQuery.swap = function( elem, options, callback, args ) {
 		var ret, name,
 			old = {};
diff --git a/src/effects/animated-selector.js b/src/effects/animatedSelector.js
index c9fa68950..c9fa68950 100644
--- a/src/effects/animated-selector.js
+++ b/src/effects/animatedSelector.js
diff --git a/src/event.js b/src/event.js
index 541326f6d..dfe923d51 100644
--- a/src/event.js
+++ b/src/event.js
@@ -4,11 +4,11 @@ define([
 	"./var/rnotwhite",
 	"./var/hasOwn",
 	"./var/slice",
+	"./event/support",
 	"./data/var/data_priv",
 	"./data/accepts",
-	"./selector",
-	"./support"
-], function( jQuery, strundefined, rnotwhite, hasOwn, slice, data_priv ) {
+	"./selector"
+], function( jQuery, strundefined, rnotwhite, hasOwn, slice, support, data_priv ) {
 
 var rkeyEvent = /^key/,
 	rmouseEvent = /^(?:mouse|contextmenu)|click/,
@@ -716,7 +716,8 @@ jQuery.each({
 
 // Create "bubbling" focus and blur events
 // Support: Firefox, Chrome, Safari
-if ( !jQuery.support.focusinBubbles ) {
+// Beware of CSP restrictions (https://developer.mozilla.org/en/Security/CSP)
+if ( !support.focusinBubbles ) {
 	jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ) {
 
 		// Attach a single capturing handler while someone wants focusin/focusout
diff --git a/src/event/support.js b/src/event/support.js
new file mode 100644
index 000000000..85060db77
--- /dev/null
+++ b/src/event/support.js
@@ -0,0 +1,9 @@
+define([
+	"../var/support"
+], function( support ) {
+
+support.focusinBubbles = "onfocusin" in window;
+
+return support;
+
+});
diff --git a/src/jquery.js b/src/jquery.js
index 2c63e3606..ef8745c7b 100644
--- a/src/jquery.js
+++ b/src/jquery.js
@@ -5,7 +5,6 @@ define([
 	"./callbacks",
 	"./deferred",
 	"./core/ready",
-	"./support",
 	"./data",
 	"./queue",
 	"./queue/delay",
@@ -16,7 +15,7 @@ define([
 	"./manipulation/_evalUrl",
 	"./wrap",
 	"./css",
-	"./css/hidden-visible-selectors",
+	"./css/hiddenVisibleSelectors",
 	"./serialize",
 	"./ajax",
 	"./ajax/xhr",
@@ -24,7 +23,7 @@ define([
 	"./ajax/jsonp",
 	"./ajax/load",
 	"./effects",
-	"./effects/animated-selector",
+	"./effects/animatedSelector",
 	"./offset",
 	"./dimensions",
 	"./deprecated",
diff --git a/src/manipulation.js b/src/manipulation.js
index 89cc46c62..f47cdec38 100644
--- a/src/manipulation.js
+++ b/src/manipulation.js
@@ -3,14 +3,14 @@ define([
 	"./var/concat",
 	"./var/push",
 	"./manipulation/var/rcheckableType",
+	"./manipulation/support",
 	"./data/var/data_priv",
 	"./data/var/data_user",
 	"./data/accepts",
 	"./selector",
 	"./traversing",
-	"./event",
-	"./support"
-], function( jQuery, concat, push, rcheckableType, data_priv, data_user ){
+	"./event"
+], function( jQuery, concat, push, rcheckableType, support, data_priv, data_user ){
 
 var rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/gi,
 	rtagName = /<([\w:]+)/,
@@ -218,7 +218,8 @@ jQuery.fn.extend({
 			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 ) ) ) {
+		if ( isFunction || !( l <= 1 || typeof value !== "string" || support.checkClone ||
+				!rchecked.test( value ) ) ) {
 			return this.each(function( index ) {
 				var self = set.eq( index );
 				if ( isFunction ) {
@@ -324,7 +325,8 @@ jQuery.extend({
 
 		// Support: IE >= 9
 		// Fix Cloning issues
-		if ( !jQuery.support.noCloneChecked && ( elem.nodeType === 1 || elem.nodeType === 11 ) && !jQuery.isXMLDoc( elem ) ) {
+		if ( !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 );
diff --git a/src/manipulation/support.js b/src/manipulation/support.js
new file mode 100644
index 000000000..62c932c11
--- /dev/null
+++ b/src/manipulation/support.js
@@ -0,0 +1,29 @@
+define([
+	"../var/support"
+], function( support ){
+
+(function () {
+	var input = document.createElement( "input" ),
+		fragment = document.createDocumentFragment();
+
+	input.type = "checkbox";
+
+	// Make sure checked status is properly cloned
+	// Support: IE9, IE10
+	input.checked = true;
+	support.noCloneChecked = input.cloneNode( true ).checked;
+
+	// #11217 - WebKit loses check when the name is after the checked attribute
+	input.setAttribute( "checked", "t" );
+	input.setAttribute( "name", "t" );
+
+	fragment.appendChild( input );
+
+	// Support: Safari 5.1, Android 4.x, Android 2.3
+	// old WebKit doesn't clone checked state correctly in fragments
+	support.checkClone = fragment.cloneNode( true ).cloneNode( true ).lastChild.checked;
+})();
+
+return support;
+
+});
diff --git a/src/support.js b/src/support.js
deleted file mode 100644
index ec15b16f3..000000000
--- a/src/support.js
+++ /dev/null
@@ -1,111 +0,0 @@
-define([
-	"./core",
-	"./core/swap",
-	// This is listed as a dependency for build order, but it's still optional in builds
-	"./core/ready"
-], function( jQuery ) {
-
-jQuery.support = (function( support ) {
-	var container, marginDiv, divStyle,
-		// Support: Firefox, Android 2.3 (Prefixed box-sizing versions).
-		divReset = "padding:0;margin:0;border:0;display:block;-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box",
-		docElem = document.documentElement,
-		input = document.createElement("input"),
-		fragment = document.createDocumentFragment(),
-		div = document.createElement("div"),
-		select = document.createElement("select"),
-		opt = select.appendChild( document.createElement("option") );
-
-	// Finish early in limited environments
-	if ( !input.type ) {
-		return support;
-	}
-
-	input.type = "checkbox";
-
-	// Support: Safari 5.1, iOS 5.1, Android 4.x, Android 2.3
-	// Check the default checkbox/radio value ("" on old WebKit; "on" elsewhere)
-	support.checkOn = input.value !== "";
-
-	// Must access the parent to make an option select properly
-	// Support: IE9, IE10
-	support.optSelected = opt.selected;
-
-	// This is hard-coded to true for compatibility reasons,
-	// all supported browsers passed the test.
-	support.boxSizing = true;
-
-	// Will be defined later
-	support.reliableMarginRight = true;
-	support.boxSizingReliable = true;
-	support.pixelPosition = false;
-
-	// Make sure checked status is properly cloned
-	// Support: IE9, IE10
-	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;
-
-	// Check if an input maintains its value after becoming a radio
-	// Support: IE9, IE10
-	input = document.createElement("input");
-	input.value = "t";
-	input.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.appendChild( input );
-
-	// Support: Safari 5.1, Android 4.x, Android 2.3
-	// old WebKit doesn't clone checked state correctly in fragments
-	support.checkClone = fragment.cloneNode( true ).cloneNode( true ).lastChild.checked;
-
-	// Support: Firefox, Chrome, Safari
-	// Beware of CSP restrictions (https://developer.mozilla.org/en/Security/CSP)
-	support.focusinBubbles = "onfocusin" in window;
-
-	div.style.backgroundClip = "content-box";
-	div.cloneNode( true ).style.backgroundClip = "";
-	support.clearCloneStyle = div.style.backgroundClip === "content-box";
-
-	container = document.createElement("div");
-	container.style.cssText = "border:0;width:0;height:0;position:absolute;top:0;left:-9999px;margin-top:1px";
-
-	// Check box-sizing and margin behavior.
-	docElem.appendChild( container ).appendChild( div );
-	div.innerHTML = "";
-	// Support: Firefox, Android 2.3 (Prefixed box-sizing versions).
-	div.style.cssText = "-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;padding:1px;border:1px;display:block;width:4px;margin-top:1%;position:absolute;top:1%";
-
-	// Use window.getComputedStyle because jsdom on node.js will break without it.
-	if ( window.getComputedStyle ) {
-		divStyle = window.getComputedStyle( div, null );
-		support.pixelPosition = ( divStyle || {} ).top !== "1%";
-		support.boxSizingReliable = ( divStyle || { width: "4px" } ).width === "4px";
-
-		// Support: Android 2.3
-		// Check if div with explicit width and no margin-right incorrectly
-		// gets computed margin-right based on width of container. (#3333)
-		// 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 );
-	}
-
-	docElem.removeChild( container );
-
-	return support;
-})( {} );
-
-});
diff --git a/src/var/support.js b/src/var/support.js
new file mode 100644
index 000000000..b25dbc74b
--- /dev/null
+++ b/src/var/support.js
@@ -0,0 +1,4 @@
+define(function() {
+	// All support tests are defined in their respective modules.
+	return {};
+});