chrome/browser/resources/pdf/pdf_viewer_shared_style.js

// Copyright 2020 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.

import {html, Polymer} from 'chrome://resources/polymer/v3_0/polymer/polymer_bundled.min.js';

const template = document.createElement('template');
template.innerHTML = `
<dom-module id="pdf-viewer-shared-style">{__html_template__}</dom-module>
`;
document.body.appendChild(template.content.cloneNode(true));