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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">
+
+<!--
+`iron-overlay-backdrop` is a backdrop used by `Polymer.IronOverlayBehavior`. It should be a
+singleton.
+
+### Styling
+
+The following custom properties and mixins are available for styling.
+
+Custom property | Description | Default
+-------------------------------------------|------------------------|---------
+`--iron-overlay-backdrop-background-color` | Backdrop background color                                     | #000
+`--iron-overlay-backdrop-opacity`          | Backdrop opacity                                              | 0.6
+`--iron-overlay-backdrop`                  | Mixin applied to `iron-overlay-backdrop`.                      | {}
+`--iron-overlay-backdrop-opened`           | Mixin applied to `iron-overlay-backdrop` when it is displayed | {}
+-->
+
+<dom-module id="iron-overlay-backdrop">
+
+  <template>
+    <style>
+      :host {
+        position: fixed;
+        top: 0;
+        left: 0;
+        width: 100%;
+        height: 100%;
+        background-color: var(--iron-overlay-backdrop-background-color, #000);
+        opacity: 0;
+        transition: opacity 0.2s;
+        pointer-events: none;
+        @apply(--iron-overlay-backdrop);
+      }
+
+      :host(.opened) {
+        opacity: var(--iron-overlay-backdrop-opacity, 0.6);
+        pointer-events: auto;
+        @apply(--iron-overlay-backdrop-opened);
+      }
+    </style>
+
+    <content></content>
+  </template>
+
+</dom-module>
+
+<script>
+(function() {
+'use strict';
+
+  Polymer({
+
+    is: 'iron-overlay-backdrop',
+
+    properties: {
+
+      /**
+       * Returns true if the backdrop is opened.
+       */
+      opened: {
+        reflectToAttribute: true,
+        type: Boolean,
+        value: false,
+        observer: '_openedChanged'
+      }
+
+    },
+
+    listeners: {
+      'transitionend': '_onTransitionend'
+    },
+
+    created: function() {
+      // Used to cancel previous requestAnimationFrame calls when opened changes.
+      this.__openedRaf = null;
+    },
+
+    attached: function() {
+      this.opened && this._openedChanged(this.opened);
+    },
+
+    /**
+     * Appends the backdrop to document body if needed.
+     */
+    prepare: function() {
+      if (this.opened && !this.parentNode) {
+        Polymer.dom(document.body).appendChild(this);
+      }
+    },
+
+    /**
+     * Shows the backdrop.
+     */
+    open: function() {
+      this.opened = true;
+    },
+
+    /**
+     * Hides the backdrop.
+     */
+    close: function() {
+      this.opened = false;
+    },
+
+    /**
+     * Removes the backdrop from document body if needed.
+     */
+    complete: function() {
+      if (!this.opened && this.parentNode === document.body) {
+        Polymer.dom(this.parentNode).removeChild(this);
+      }
+    },
+
+    _onTransitionend: function(event) {
+      if (event && event.target === this) {
+        this.complete();
+      }
+    },
+
+    /**
+     * @param {boolean} opened
+     * @private
+     */
+    _openedChanged: function(opened) {
+      if (opened) {
+        // Auto-attach.
+        this.prepare();
+      } else {
+        // Animation might be disabled via the mixin or opacity custom property.
+        // If it is disabled in other ways, it's up to the user to call complete.
+        var cs = window.getComputedStyle(this);
+        if (cs.transitionDuration === '0s' || cs.opacity == 0) {
+          this.complete();
+        }
+      }
+
+      if (!this.isAttached) {
+        return;
+      }
+
+      // Always cancel previous requestAnimationFrame.
+      if (this.__openedRaf) {
+        window.cancelAnimationFrame(this.__openedRaf);
+        this.__openedRaf = null;
+      }
+      // Force relayout to ensure proper transitions.
+      this.scrollTop = this.scrollTop;
+      this.__openedRaf = window.requestAnimationFrame(function() {
+        this.__openedRaf = null;
+        this.toggleClass('opened', this.opened);
+      }.bind(this));
+    }
+  });
+
+})();
+
+</script>