| <!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'; | |
| if (!Polymer.Settings.useNativeShadow) { | |
| tr.b.showPanic('Polymer error', 'base only works in shadow mode'); | |
| } | |
| </script> |