systrace/catapult/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
-->

<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../neon-animation-behavior.html">
<link rel="import" href="../web-animations.html">

<!--
`<opaque-animation>` makes an element `opacity:1` for the duration of the animation. Used to prevent
webkit/safari from drawing a frame before an animation for elements that animate from display:none.
-->

<script>

  Polymer({

    is: 'opaque-animation',

    behaviors: [
      Polymer.NeonAnimationBehavior
    ],

    configure: function(config) {
      var node = config.node;
      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>