polymer neon - hero animation

button ripples.js

//handle clicks within a certain scope (say a template)
var scope = document.querySelector('template[is="dom-bind"]');

//ripple click target to full screen or at least container scopr
 scope._onPolymerClick = function(event) {
    this.$.list.sharedElements = {
      'ripple': event.target,
      'reverse-ripple': event.target
    };
        //handle click 
  };

x-card.html

<link rel="import" href="../../neon-shared-element-animatable-behavior.html">

<dom-module id="x-card">
  <template>
    <style>
      :host {
        display: block;
        overflow: hidden;
      }
      #placeholder {
        opacity: 0;
        background-color: grey;
        @apply(--layout-fit);
      }
    </style>

    <div id="placeholder"></div>
    <div id="container">
      <content select="div"></content>
    </div>

  </template>
</dom-module>

<script>
(function() {
  Polymer({
    is: 'x-card',
    behaviors: [
      Polymer.NeonSharedElementAnimatableBehavior
    ],
    properties: {
      animationConfig: {
        value: function() {
          return {
            'entry': [{
              name: 'ripple-animation',
              id: 'ripple',
              toPage: this
            }, {
              name: 'fade-out-animation',
              node: this.$.placeholder,
              timing: {
                delay: 250
              }
            }, {
              name: 'fade-in-animation',
              node: this.$.container,
              timing: {
                delay: 50
              }
            }],
            'exit': [{
              name: 'fade-out-animation',
              node: this.$.container,
              timing: {
                duration: 0
              }
            }, {
              name: 'reverse-ripple-animation',
              id: 'reverse-ripple',
              fromPage: this
            }]
          };
        }
      },
      sharedElements: {
        value: function() {
          return {
            'ripple': this.$.placeholder,
            'reverse-ripple': this.$.placeholder
          };
        }
      }
    }
  });
})();
</script>