Rename private attribute _element to _el

Change-Id: I9c7a31bd6844636737ffa6456562b997f5e370a3
diff --git a/dev/js/spec/hintSpec.js b/dev/js/spec/hintSpec.js
index 45850a4..a78a835 100644
--- a/dev/js/spec/hintSpec.js
+++ b/dev/js/spec/hintSpec.js
@@ -84,7 +84,7 @@
     it('should be initializable', function () {
       // Supports: context, searchField
       var inputField = inputClass.create(input);
-      expect(inputField._element).not.toBe(undefined);
+      expect(inputField._el).not.toBe(undefined);
     });
 
     it('should have text', function () {