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

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;
+
+});

src/css/swap.js

@@ -0,0 +1,27 @@
+define([
+	"../core"
+], function( jQuery ) {
+
+	// A method for quickly swapping in/out CSS properties to get correct calculations.
+	jQuery.swap = function( elem, options, callback, args ) {
+		var ret, name,
+			old = {};
+
+		// Remember the old values, and insert the new ones
+		for ( name in options ) {
+			old[ name ] = elem.style[ name ];
+			elem.style[ name ] = options[ name ];
+		}
+
+		ret = callback.apply( elem, args || [] );
+
+		// Revert the old values
+		for ( name in options ) {
+			elem.style[ name ] = old[ name ];
+		}
+
+		return ret;
+	};
+
+	return jQuery.swap;
+});