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/src/ngAnimate/animate.js b/src/ngAnimate/animate.js
index 8ff7b429..aeb6e32e 100644
--- a/src/ngAnimate/animate.js
+++ b/src/ngAnimate/animate.js
@@ -1237,7 +1237,7 @@ angular.module('ngAnimate', ['ng'])
           //make the element super hidden and override any CSS style values
           clone.attr('style','position:absolute; top:-9999px; left:-9999px');
           clone.removeAttr('id');
-          clone.html('');
+          clone.empty();
 
           forEach(oldClasses.split(' '), function(klass) {
             clone.removeClass(klass);