Selector: Detect incorrect escape handling by old Firefox

Fixes jquerygh-454
mgol · Aug 19, 2019 · c181155 · c181155
1 parent 5d90d4f
commit c181155
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/sizzle.js b/src/sizzle.js
@@ -846,6 +846,12 @@ setDocument = Sizzle.setDocument = function( node ) {
 				rbuggyQSA.push( ":enabled", ":disabled" );
 			}
 
+			// Support: Firefox <=3.6 - 5 only
+			// Old Firefox doesn't throw on a badly-escaped identifier.
+			el.querySelectorAll( "x\\\f" );
+			rbuggyQSA.push( "\\r", "\\n", "\\f" );
+
+			// Support: Opera 10 - 11 only
 			// Opera 10-11 does not throw on post-comma invalid pseudos
 			el.querySelectorAll( "*,:x" );
 			rbuggyQSA.push( ",.*:" );