chromium/ash/webui/connectivity_diagnostics/resources/index.html

<!-- Copyright 2020 The Chromium Authors
     Use of this source code is governed by a BSD-style license that can be
     found in the LICENSE file. -->
<!DOCTYPE html>
<style>
  html {
    height: 100%;
  }
  body {
    box-sizing: border-box;
    height: 100%;
    margin: 0;  /* box-sizing does not respect margin */
    padding: 8px;
  }
</style>
<html>
  <head>
    <meta charset="utf-8">
    <title>$i18n{appTitle}</title>
  </head>
  <body>
    <connectivity-diagnostics></connectivity-diagnostics>

    <script type="module" src="connectivity_diagnostics.js"></script>
  </body>
</html>