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chromium/content/browser/resources/webxr_internals/webxr_internals.html 

<!DOCTYPE html>
<html>
<head>
  <title>WebXR Internals</title>
  <link rel="stylesheet" href="chrome://resources/css/text_defaults.css">
  <link rel="stylesheet" href="webxr_internals.css">
</head>
<body>
  <div class="page-header">
    <h1>WebXR Internals</h1>
    <h3>This page is intended for debugging purposes only</h3>
  </div>
  <div class="container">
    <div class="sidebar">
      <button id="device-info-button" class="tab-button active">
        Device Info
      </button>
      <button id="runtime-info-button" class="tab-button">
        XRRuntime Info
      </button>
      <button id="session-info-button" class="tab-button">
        XRSession Info
      </button>
      <button id="session-statistics-button" class="tab-button">
        XRSession Statistics
      </button>
    </div>
    <div class="content">
      <div id="device-info-content" class="tab-content active"></div>
      <div id="runtime-info-content" class="tab-content"></div>
      <div id="session-info-content" class="tab-content"></div>
      <div id="session-statistics-content" class="tab-content"></div>
    </div>
  </div>
  <script type="module" src="webxr_internals.js"></script>
</body>
</html>