Rename private attribute _element to _el

Change-Id: I9c7a31bd6844636737ffa6456562b997f5e370a3
diff --git a/dev/js/spec/vcSpec.js b/dev/js/spec/vcSpec.js
index f30498e..7beede7 100644
--- a/dev/js/spec/vcSpec.js
+++ b/dev/js/spec/vcSpec.js
@@ -1336,14 +1336,14 @@
 
       // Remove operand 1
       expect(docGroup.delOperand(doc).update()).not.toBeUndefined();
-      expect(doc._element).toEqual(undefined);
+      expect(doc._el).toEqual(undefined);
 
       doc = docGroup.getOperand(1);
       expect(doc.key()).toEqual("foo");
 
       // Remove operand 1
       expect(docGroup.delOperand(doc).update()).not.toBeUndefined();
-      expect(doc._element).toEqual(undefined);
+      expect(doc._el).toEqual(undefined);
 
       // Only one operand left ...
       expect(docGroup.getOperand(1)).toBeUndefined();