popup.html | Explore in Territory

<html>
<head>
  <script src="popup.js"></script>
</head>
<body>
  <div>This popup contains a fenced frame.</div>
  <fencedframe name="child_frame" src="about:blank"></fencedframe>
</body>
</html>

chromium/chrome/test/data/extensions/api_test/browser_action/popup_with_fencedframe/popup.html