| <!DOCTYPE html> | |
| <!-- | |
| Copyright 2016 The Chromium Authors. All rights reserved. | |
| Use of this source code is governed by a BSD-style license that can be | |
| found in the LICENSE file. | |
| --> | |
| <script> | |
| 'use strict'; | |
| // Force Polymer into native shadowDom mode | |
| if (window.Polymer) | |
| throw new Error('Cannot proceed. Polymer already present.'); | |
| window.Polymer = {}; | |
| window.Polymer.dom = 'shadow'; | |
| </script> |