text: Polymer({
  
      is: 'hero-animation',
  
      behaviors: [
        Polymer.NeonSharedElementAnimationBehavior
      ],
  
      configure: function(config) {
        var shared = this.findSharedElements(config);
        if (!shared) {
          return;
        }
  
        var fromRect = shared.from.getBoundingClientRect();
        var toRect = shared.to.getBoundingClientRect();
  
        var deltaLeft = fromRect.left - toRect.left;
        var deltaTop = fromRect.top - toRect.top;
        var deltaWidth = fromRect.width / toRect.width;
        var deltaHeight = fromRect.height / toRect.height;
  
        this._effect = new KeyframeEffect(shared.to, [
          {'transform': 'translate(' + deltaLeft + 'px,' + deltaTop + 'px) scale(' + deltaWidth + ',' + deltaHeight + ')'},
          {'transform': 'none'}
        ], this.timingFromConfig(config));
  
        this.setPrefixedProperty(shared.to, 'transformOrigin', '0 0');
        shared.to.style.zIndex = 10000;
        shared.from.style.visibility = 'hidden';
  
        return this._effect;
      },
  
      complete: function(config) {
        var shared = this.findSharedElements(config);
        if (!shared) {
          return null;
        }
        shared.to.style.zIndex = '';
        shared.from.style.visibility = '';
      }
  
    });