Landing pull request 490. 1.7 HTML5 Support for innerHTML, clone & style. Fixes #6485.

More Details:
 - https://github.com/jquery/jquery/pull/490
 - http://bugs.jquery.com/ticket/6485

src/manipulation.js

@@ -20,7 +20,23 @@ var rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
 		col: [ 2, "<table><tbody></tbody><colgroup>", "</colgroup></table>" ],
 		area: [ 1, "<map>", "</map>" ],
 		_default: [ 0, "", "" ]
-	};
+	},
+	safeFragment = (function() {
+		var nodeNames = (
+			"abbr article aside audio canvas datalist details figcaption figure footer " +
+			"header hgroup mark meter nav output progress section summary time video"
+		).split( " " ),
+		safeFrag = document.createDocumentFragment();
+
+		if ( safeFrag.createElement ) {
+			while ( nodeNames.length ) {
+				safeFrag.createElement(
+					nodeNames.pop()
+				);
+			}
+		}
+		return safeFrag;
+	})();
 
 wrapMap.optgroup = wrapMap.option;
 wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
@@ -625,6 +641,9 @@ jQuery.extend({
 						depth = wrap[0],
 						div = context.createElement("div");
 
+					// Append wrapper element to unknown element safe doc fragment
+					safeFragment.appendChild( div );
+
 					// Go to html and back, then peel off extra wrappers
 					div.innerHTML = wrap[1] + elem + wrap[2];
 

src/support.js

@@ -24,7 +24,7 @@ jQuery.support = (function() {
 
 	// Preliminary tests
 	div.setAttribute("className", "t");
-	div.innerHTML = "   <link/><table></table><a href='/a' style='top:1px;float:left;opacity:.55;'>a</a><input type='checkbox'/>";
+	div.innerHTML = "   <link/><table></table><a href='/a' style='top:1px;float:left;opacity:.55;'>a</a><input type='checkbox'/><nav></nav>";
 
 
 	all = div.getElementsByTagName( "*" );
@@ -69,6 +69,9 @@ jQuery.support = (function() {
 		// (IE uses styleFloat instead of cssFloat)
 		cssFloat: !!a.style.cssFloat,
 
+		// Make sure unknown elements (like HTML5 elems) are handled appropriately
+		unknownElems: !!div.getElementsByTagName( "nav" ).length,
+
 		// Make sure that if no value is specified for a checkbox
 		// that it defaults to "on".
 		// (WebKit defaults to "" instead)