Fix #10844. Harden quickIs() against form-aliasing of the id property.

src/event.js

@@ -18,10 +18,11 @@ var rformElems = /^(?:textarea|input|select)$/i,
 		return quick;
 	},
 	quickIs = function( elem, m ) {
+		var attrs = elem.attributes || {};
 		return (
 			(!m[1] || elem.nodeName.toLowerCase() === m[1]) &&
-			(!m[2] || elem.id === m[2]) &&
-			(!m[3] || m[3].test( ((elem.attributes || {})[ "class" ] || {}).value ))
+			(!m[2] || (attrs.id || {}).value === m[2]) &&
+			(!m[3] || m[3].test( (attrs[ "class" ] || {}).value ))
 		);
 	},
 	hoverHack = function( events ) {

test/unit/event.js

@@ -1209,6 +1209,29 @@ test("Delegated events in SVG (#10791)", function() {
 	svg.remove();
 });
 
+test("Delegated events in forms (#10844)", function() {
+	expect(1);
+
+	// Aliases names like "id" cause havoc
+	var form = jQuery(
+			'<form id="myform">'+
+			'<input type="text" name="id" value="secret agent man" />'+
+			'</form>'
+		).appendTo( "body" );
+	
+	jQuery( "body" )
+		.on( "submit", "#myform", function() {
+			ok( true, "delegated id selector with aliased name" );
+			return false;
+		})
+		.find( "#myform" )
+			.trigger( "submit" )
+		.end()
+		.off( "submit" );
+
+	form.remove();
+});
+
 test("jQuery.Event( type, props )", function() {
 
 	expect(5);