elem.getElementsByTagName calls the function in IE6/7. Fixes #9370.

src/manipulation.js

@@ -533,7 +533,7 @@ function fixDefaultChecked( elem ) {
 function findInputs( elem ) {
 	if ( jQuery.nodeName( elem, "input" ) ) {
 		fixDefaultChecked( elem );
-	} else if ( elem.getElementsByTagName ) {
+	} else if ( "getElementsByTagName" in elem ) {
 		jQuery.grep( elem.getElementsByTagName("input"), fixDefaultChecked );
 	}
 }