CSS: Add a support test for the hack for .css('marginRight') etc.

This hack turns out to be needed by Android 4.0-4.3.

Add a support test so that the hack is invoked only where needed.

Refs 3747cc642a48d2a5a8ac83069f66bddd33bea301

Refs gh-1815
Refs gh-1820
Refs gh-1842
Closes gh-2061

src/css/curCSS.js

@@ -3,8 +3,9 @@ define([
 	"../core",
 	"./var/rnumnonpx",
 	"./var/rmargin",
+	"./support",
 	"../selector" // contains
-], function( exports, jQuery, rnumnonpx, rmargin ) {
+], function( exports, jQuery, rnumnonpx, rmargin, support ) {
 
 var getStyles, curCSS,
 	rposition = /^(top|right|bottom|left)$/;
@@ -36,13 +37,12 @@ if ( window.getComputedStyle ) {
 				ret = jQuery.style( elem, name );
 			}
 
-			// Support: Android 4.0-4.3
 			// A tribute to the "awesome hack by Dean Edwards"
 			// Android Browser returns percentage for some values,
 			// but width seems to be reliably pixels.
 			// This is against the CSSOM draft spec:
 			// http://dev.w3.org/csswg/cssom/#resolved-values
-			if ( rnumnonpx.test( ret ) && rmargin.test( name ) ) {
+			if ( !support.pixelMarginRight() && rnumnonpx.test( ret ) && rmargin.test( name ) ) {
 
 				// Remember the original values
 				width = style.width;

src/css/support.js

@@ -4,8 +4,7 @@ define([
 ], function( jQuery, support ) {
 
 (function() {
-	// Minified: var b,c,d,e,f,g, h,i
-	var div, style, a, pixelPositionVal, boxSizingReliableVal,
+	var div, container, style, a, pixelPositionVal, boxSizingReliableVal, pixelMarginRightVal,
 		reliableHiddenOffsetsVal, reliableMarginRightVal;
 
 	// Setup
@@ -33,21 +32,37 @@ define([
 	div.cloneNode( true ).style.backgroundClip = "";
 	support.clearCloneStyle = div.style.backgroundClip === "content-box";
 
+	container = document.createElement( "div" );
+	container.style.cssText = "border:0;width:8px;height:0;top:0;left:-9999px;" +
+		"padding:0;margin-top:1px;position:absolute";
+	div.innerHTML = "";
+	container.appendChild( div );
+
 	jQuery.extend(support, {
 		reliableHiddenOffsets: function() {
-			if ( reliableHiddenOffsetsVal == null ) {
+			if ( pixelPositionVal == null ) {
 				computeStyleTests();
 			}
 			return reliableHiddenOffsetsVal;
 		},
 
 		boxSizingReliable: function() {
-			if ( boxSizingReliableVal == null ) {
+			// We're checking for pixelPositionVal here instead of boxSizingReliableVal
+			// since that compresses better and they're computed together anyway.
+			if ( pixelPositionVal == null ) {
 				computeStyleTests();
 			}
 			return boxSizingReliableVal;
 		},
 
+		pixelMarginRight: function() {
+			// Support: Android 4.0-4.3
+			if ( pixelPositionVal == null ) {
+				computeStyleTests();
+			}
+			return pixelMarginRightVal;
+		},
+
 		pixelPosition: function() {
 			if ( pixelPositionVal == null ) {
 				computeStyleTests();
@@ -55,9 +70,9 @@ define([
 			return pixelPositionVal;
 		},
 
-		// Support: Android 2.3
 		reliableMarginRight: function() {
-			if ( reliableMarginRightVal == null ) {
+			// Support: Android 2.3
+			if ( pixelPositionVal == null ) {
 				computeStyleTests();
 			}
 			return reliableMarginRightVal;
@@ -65,8 +80,7 @@ define([
 	});
 
 	function computeStyleTests() {
-		// Minified: var b,c,d,j
-		var div, container, contents,
+		var contents, divStyle,
 			body = document.body;
 
 		if ( !body || !body.style ) {
@@ -75,17 +89,16 @@ define([
 		}
 
 		// Setup
-		div = document.createElement( "div" );
-		container = document.createElement( "div" );
-		container.style.cssText = "position:absolute;border:0;width:0;height:0;top:0;left:-9999px";
-		body.appendChild( container ).appendChild( div );
+		body.appendChild( container );
 
 		div.style.cssText =
 			// Support: Android 2.3
 			// Vendor-prefix box-sizing
 			"-webkit-box-sizing:border-box;box-sizing:border-box;" +
-			"display:block;margin-top:1%;top:1%;" +
-			"border:1px;padding:1px;width:4px;position:absolute";
+			"position:absolute;display:block;" +
+			"margin:0;margin-top:1%;margin-right:50%;" +
+			"border:1px;padding:1px;" +
+			"top:1%;height:4px;width:50%";
 
 		// Support: IE<9
 		// Assume reasonable values in the absence of getComputedStyle
@@ -94,9 +107,10 @@ define([
 
 		// Check for getComputedStyle so that this code is not run in IE<9.
 		if ( window.getComputedStyle ) {
-			pixelPositionVal = ( window.getComputedStyle( div, null ) || {} ).top !== "1%";
-			boxSizingReliableVal =
-				( window.getComputedStyle( div, null ) || { width: "4px" } ).width === "4px";
+			divStyle = window.getComputedStyle( div, null );
+			pixelPositionVal = ( divStyle || {} ).top !== "1%";
+			boxSizingReliableVal = ( divStyle || { height: "4px" } ).height === "4px";
+			pixelMarginRightVal = ( divStyle || { marginRight: "4px" } ).marginRight === "4px";
 
 			// Support: Android 2.3
 			// Div with explicit width and no margin-right incorrectly
@@ -136,6 +150,7 @@ define([
 			reliableHiddenOffsetsVal = contents[ 0 ].offsetHeight === 0;
 		}
 
+		// Teardown
 		body.removeChild( container );
 	}
 

test/unit/support.js

@@ -94,6 +94,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": true,
 			"optSelected": true,
 			"ownLast": false,
+			"pixelMarginRight": true,
 			"pixelPosition": true,
 			"radioValue": true,
 			"reliableHiddenOffsets": true,
@@ -125,6 +126,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": true,
 			"optSelected": false,
 			"ownLast": false,
+			"pixelMarginRight": true,
 			"pixelPosition": true,
 			"radioValue": false,
 			"reliableHiddenOffsets": true,
@@ -156,6 +158,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": true,
 			"optSelected": false,
 			"ownLast": false,
+			"pixelMarginRight": true,
 			"pixelPosition": true,
 			"radioValue": false,
 			"reliableHiddenOffsets": true,
@@ -187,6 +190,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": true,
 			"optSelected": false,
 			"ownLast": true,
+			"pixelMarginRight": true,
 			"pixelPosition": false,
 			"radioValue": false,
 			"reliableHiddenOffsets": false,
@@ -218,6 +222,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": true,
 			"optSelected": true,
 			"ownLast": false,
+			"pixelMarginRight": true,
 			"pixelPosition": false,
 			"radioValue": true,
 			"reliableHiddenOffsets": true,
@@ -249,6 +254,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": true,
 			"optSelected": true,
 			"ownLast": false,
+			"pixelMarginRight": true,
 			"pixelPosition": false,
 			"radioValue": true,
 			"reliableHiddenOffsets": true,
@@ -280,6 +286,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": true,
 			"optSelected": true,
 			"ownLast": false,
+			"pixelMarginRight": true,
 			"pixelPosition": true,
 			"radioValue": true,
 			"reliableHiddenOffsets": true,
@@ -311,6 +318,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": true,
 			"optSelected": true,
 			"ownLast": false,
+			"pixelMarginRight": true,
 			"pixelPosition": false,
 			"radioValue": true,
 			"reliableHiddenOffsets": true,
@@ -342,6 +350,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": true,
 			"optSelected": true,
 			"ownLast": false,
+			"pixelMarginRight": true,
 			"pixelPosition": false,
 			"radioValue": true,
 			"reliableHiddenOffsets": true,
@@ -373,6 +382,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": true,
 			"optSelected": true,
 			"ownLast": false,
+			"pixelMarginRight": false,
 			"pixelPosition": false,
 			"radioValue": true,
 			"reliableHiddenOffsets": true,
@@ -404,6 +414,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"optDisabled": false,
 			"optSelected": true,
 			"ownLast": false,
+			"pixelMarginRight": true,
 			"pixelPosition": false,
 			"radioValue": true,
 			"reliableHiddenOffsets": true,