Landing in jQuery.contains, jQuery.fn.contains, and jQuery.fn.has support. Fixes #4101.

src/sizzle-jquery.js

@@ -4,5 +4,6 @@ jQuery.expr[":"] = jQuery.expr.filters;
 jQuery.unique = Sizzle.uniqueSort;
 jQuery.getText = getText;
 jQuery.isXMLDoc = isXML;
+jQuery.contains = contains;
 
 return;

src/traversing.js

@@ -57,6 +57,21 @@ jQuery.fn.extend({
 		return ret;
 	},
 
+	has: function( target ) {
+		var targets = jQuery( target );
+		return this.filter(function() {
+			for ( var i = 0, l = targets.length; i < l; i++ ) {
+				if ( jQuery.contains( this, targets[i] ) ) {
+					return true;
+				}
+			}
+		});
+	},
+
+	contains: function( target ) {
+		return this.has( target ).length > 0;
+	},
+
 	not: function( selector ) {
 		return this.pushStack( winnow(this, selector, false), "not", selector);
 	},

test/unit/traversing.js

@@ -152,7 +152,43 @@ test("not(jQuery)", function() {
 	expect(1);
 
 	same( jQuery("p").not(jQuery("#ap, #sndp, .result")).get(), q("firstp", "en", "sap", "first"), "not(jQuery)" );
-})
+});
+
+test("has(Element)", function() {
+	expect(2);
+
+	var obj = jQuery("#main").has(jQuery("#sndp")[0]);
+	same( obj.get(), q("main"), "Keeps elements that have the element as a descendant" );
+
+	var multipleParent = jQuery("#main, #header").has(jQuery("#sndp")[0]);
+	same( obj.get(), q("main"), "Does not include elements that do not have the element as a descendant" );
+});
+
+test("has(Selector)", function() {
+	expect(3);
+
+	var obj = jQuery("#main").has("#sndp");
+	same( obj.get(), q("main"), "Keeps elements that have any element matching the selector as a descendant" );
+
+	var multipleParent = jQuery("#main, #header").has("#sndp");
+	same( obj.get(), q("main"), "Does not include elements that do not have the element as a descendant" );
+
+	var multipleHas = jQuery("#main").has("#sndp, #first");
+	same( multipleHas.get(), q("main"), "Only adds elements once" );
+});
+
+test("has(Arrayish)", function() {
+	expect(3);
+
+	var simple = jQuery("#main").has(jQuery("#sndp"));
+	same( simple.get(), q("main"), "Keeps elements that have any element in the jQuery list as a descendant" );
+
+	var multipleParent = jQuery("#main, #header").has(jQuery("#sndp"));
+	same( multipleParent.get(), q("main"), "Does not include elements that do not have an element in the jQuery list as a descendant" );
+
+	var multipleHas = jQuery("#main").has(jQuery("#sndp, #first"));
+	same( simple.get(), q("main"), "Only adds elements once" );
+});
 
 test("andSelf()", function() {
 	expect(4);