Merge branch 'x8908'

src/css.js

@@ -198,6 +198,7 @@ jQuery.extend({
 
 			// If a hook was provided, use that value, otherwise just set the specified value
 			if ( !hooks || !("set" in hooks) || (value = hooks.set( elem, value, extra )) !== undefined ) {
+
 				// Wrapped to prevent IE from throwing errors when 'invalid' values are provided
 				// Fixes bug #5509
 				try {
@@ -515,6 +516,15 @@ jQuery.each([ "height", "width" ], function( i, name ) {
 	};
 });
 
+if ( !jQuery.support.clearCloneStyle ) {
+	// #8908, this part for IE9 only; see gh-886
+	jQuery.cssHooks.backgroundPosition = {
+		set: function( elem, value ) {
+			return value === "" ? "0% 0%" : value;
+		}
+	};
+}
+
 if ( !jQuery.support.opacity ) {
 	jQuery.cssHooks.opacity = {
 		get: function( elem, computed ) {

src/manipulation.js

@@ -596,8 +596,12 @@ jQuery.extend({
 			clone;
 
 		if ( jQuery.support.html5Clone || jQuery.isXMLDoc(elem) || !rnoshimcache.test( "<" + elem.nodeName + ">" ) ) {
-			clone = elem.cloneNode( true );
+			// Break the original-clone style connection in IE9/10 (#8909)
+			if ( !jQuery.support.clearCloneStyle && elem.nodeType === 1 ) {
+				i = ( window.getComputedStyle( elem, null ) || {} ).backgroundPosition;
+			}
 
+			clone = elem.cloneNode( true );
 		// IE<=8 does not properly clone detached, unknown element nodes
 		} else {
 			fragmentDiv.innerHTML = elem.outerHTML;

src/support.js

@@ -169,6 +169,10 @@ jQuery.support = (function() {
 		}
 	}
 
+	div.style.backgroundClip = "content-box";
+	div.cloneNode( true ).style.backgroundClip = "";
+	support.clearCloneStyle = div.style.backgroundClip === "content-box";
+
 	// Run tests that need a body at doc ready
 	jQuery(function() {
 		var container, div, tds, marginDiv,