Fix #11356. Avoid hoarding elements in DocumentFragments.

src/manipulation.js

@@ -676,7 +676,9 @@ jQuery.extend({
 					var tag = ( rtagName.exec( elem ) || ["", ""] )[1].toLowerCase(),
 						wrap = wrapMap[ tag ] || wrapMap._default,
 						depth = wrap[0],
-						div = context.createElement("div");
+						div = context.createElement("div"),
+						safeChildNodes = safeFragment.childNodes,
+						remove;
 
 					// Append wrapper element to unknown element safe doc fragment
 					if ( context === document ) {
@@ -721,6 +723,17 @@ jQuery.extend({
 					}
 
 					elem = div.childNodes;
+
+					// Clear elements from DocumentFragment (safeFragment or otherwise)
+					// to avoid hoarding elements. Fixes #11356
+					if ( div ) {
+						div.parentNode.removeChild( div );
+						remove = safeChildNodes[ safeChildNodes.length - 1 ];
+
+						if ( remove && remove.parentNode ) {
+							remove.parentNode.removeChild( remove );
+						}
+					}
 				}
 			}