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chromium/chrome/browser/resources/media_router/internals/media_router_internals.html 

<!DOCTYPE HTML>
<html lang="en">

<head>
  <meta charset="utf-8">
  <link rel="stylesheet" href="chrome://resources/css/text_defaults.css">
  <link rel="stylesheet" href="media_router_internals.css">
  <script type="module" src="media_router_internals.js"></script>
</head>

<body>
  <h1>Media Router Internals</h1>
  <cr-tab-box>
    <div slot="tab">Sink status</div>
    <div slot="tab">Cast media route provider</div>
    <div slot="tab">Mirroring stats</div>
    <div slot="tab">Logs</div>
    <div id="sink-status-slot" slot="panel">
      <div id="sink-status-div" class="status"></div>
    </div>
    <div id="cast-media-route-provider-slot" slot="panel">
      <div id="cast-status-div" class="status"></div>
    </div>
    <div id="mirroring-stats-slot" slot="panel">
      <div id="mirroring-stats-div" class="status"></div>
    </div>
    <div id="logs-slot" slot="panel">
      <table id="logs-table">
        <tr>
          <th>Time</th>
          <th class="log-message">Message</th>
          <th>SessionID</th>
          <th>SinkID</th>
          <th>MediaSource</th>
          <th>Category</th>
          <th>Component</th>
          <th>Severity</th>
        </tr>
      </table>
    </div>
  </cr-tab-box>
</body>

</html>