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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-animatable-behavior.html">
+
+<script>
+
+  /**
+   * Use `Polymer.NeonSharedElementAnimatableBehavior` to implement elements containing shared element
+   * animations.
+   * @polymerBehavior Polymer.NeonSharedElementAnimatableBehavior
+   */
+  Polymer.NeonSharedElementAnimatableBehaviorImpl = {
+
+    properties: {
+
+      /**
+       * A map of shared element id to node.
+       */
+      sharedElements: {
+        type: Object,
+        value: {}
+      }
+
+    }
+
+  };
+
+  /** @polymerBehavior Polymer.NeonSharedElementAnimatableBehavior */
+  Polymer.NeonSharedElementAnimatableBehavior = [
+    Polymer.NeonAnimatableBehavior,
+    Polymer.NeonSharedElementAnimatableBehaviorImpl
+  ];
+
+</script>