1 files changed, 22 insertions, 0 deletions
diff --git a/src/selector/contains.js b/src/selector/contains.js
new file mode 100644
index 000000000..0d6273c28
--- /dev/null
+++ b/src/selector/contains.js
@@ -0,0 +1,22 @@
+define( [
+	"../core"
+], function( jQuery ) {
+
+"use strict";
+
+// Note: an element does not contain itself
+jQuery.contains = function( a, b ) {
+	var adown = a.nodeType === 9 ? a.documentElement : a,
+		bup = b && b.parentNode;
+
+	return a === bup || !!( bup && bup.nodeType === 1 && (
+
+		// Support: IE 9 - 11+
+		// IE doesn't have `contains` on SVG.
+		adown.contains ?
+			adown.contains( bup ) :
+			a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
+	) );
+};
+
+} );