perf(jqLite): implement and use the `empty` method in place of `html(‘’)`

jQuery's elem.html('') is way slower than elem.empty(). As clearing
element contents happens quite often in certain scenarios, switching
to using .empty() provides a significant performance boost when using
Angular with jQuery.

Closes #4457

1 files changed, 1 insertions, 1 deletions

diff --git a/test/ng/directive/formSpec.js b/test/ng/directive/formSpec.js
index 77beb2fd..dde6f0a0 100644
--- a/test/ng/directive/formSpec.js
+++ b/test/ng/directive/formSpec.js
@@ -216,7 +216,7 @@ describe('form', function() {
         // yes, I know, scope methods should not do direct DOM manipulation, but I wanted to keep
         // this test small. Imagine that the destroy action will cause a model change (e.g.
         // $location change) that will cause some directive to destroy the dom (e.g. ngView+$route)
-        doc.html('');
+        doc.empty();
         destroyed = true;
       }