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third_party/polymer/components/neon-animation/animations/opaque-animation.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
@@ skipping 11 matching lines @@
   Polymer({
 
     is: 'opaque-animation',
 
     behaviors: [
       Polymer.NeonAnimationBehavior
     ],
 
     configure: function(config) {
       var node = config.node;
-      node.style.opacity = '0';
       this._effect = new KeyframeEffect(node, [
         {'opacity': '1'},
         {'opacity': '1'}
       ], this.timingFromConfig(config));
+      node.style.opacity = '0';
       return this._effect;
     },
 
     complete: function(config) {
       config.node.style.opacity = '';
     }
 
   });
 
 </script>