Traversing: Fix contents() on <object>s with children in IE

mgol · mgol · commit b6e824277eb2 · 2019-05-06T21:05:14.000+02:00
The original fix didn't account for the fact that in IE `<object>` elements with no `data` attribute have an object `contentDocument`. The fix leverages the fact that this special object has a null prototype. Ref jquerygh-4384 Ref jquerygh-4385
diff --git a/src/traversing.js b/src/traversing.js
@@ -145,7 +145,13 @@ jQuery.each( {
 		return siblings( elem.firstChild );
 	},
 	contents: function( elem ) {
-		if ( elem.contentDocument != null ) {
+		if ( elem.contentDocument != null &&
+
+			// Support: IE 11+
+			// <object> elements with no `data` attribute has an object
+			// `contentDocument` with a `null` prototype.
+			Object.getPrototypeOf( elem.contentDocument ) ) {
+
 			return elem.contentDocument;
 		}
 
