chromium/chrome/browser/resources/webui_js_error/webui_js_error.html

<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <title>$i18n{title}</title>
    <style>
      html,
      body {
        height: 100%;
        overflow: hidden;
      }

      body {
        margin: 0;
      }
    </style>
  </head>
  <body>$i18n{explainerText}<div>
      <!-- Ids are referenced in integration tests, including tast tests -->
      <button id="error-button" accesskey="l">$i18n{logErrorButton}</button>
      <button id="exception-button" accesskey="t">
        $i18n{uncaughtErrorButton}
      </button>
      <button id="promise-button" accesskey="p">
        $i18n{promiseRejectButton}
      </button>
    </div>
    <script type="module" src="webui_js_error.js"></script>
  </body>
</html>