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+<!--
+@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-shared-element-animation-behavior.html">
+<link rel="import" href="../web-animations.html">
+
+<!--
+`<hero-animation>` is a shared element animation that scales and transform an element such that it
+appears to be shared between two pages. Use this in `<neon-animated-pages>`. The source page
+should use this animation in an 'exit' animation and set the `fromPage` configuration property to
+itself, and the destination page should use this animation in an `entry` animation and set the
+`toPage` configuration property to itself. They should also define the hero elements in the
+`sharedElements` property (not a configuration property, see
+`Polymer.NeonSharedElementAnimatableBehavior`).
+
+Configuration:
+```
+{
+  name: 'hero-animation',
+  id: <shared-element-id>,
+  timing: <animation-timing>,
+  toPage: <node>, /* define for the destination page */
+  fromPage: <node>, /* define for the source page */
+}
+```
+-->
+
+<script>
+
+  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 = '';
+    }
+
+  });
+
+</script>