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third_party/polymer/components/iron-overlay-behavior/iron-overlay-backdrop.html

 <!--
 @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
 -->
 
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 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">
 
-  <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);
-    }
+  <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>
+      :host(.opened) {
+        opacity: var(--iron-overlay-backdrop-opacity, 0.6);
+        pointer-events: auto;
+        @apply(--iron-overlay-backdrop-opened);
+      }
+    </style>
 
-  <template>
     <content></content>
   </template>
 
 </dom-module>
 
 <script>
 (function() {
 'use strict';
 
   Polymer({
@@ skipping 96 matching lines @@
       this.__openedRaf = window.requestAnimationFrame(function() {
         this.__openedRaf = null;
         this.toggleClass('opened', this.opened);
       }.bind(this));
     }
   });
 
 })();
 
 </script>