frameset-frameborder-dynamic.html | Explore in Territory

<!DOCTYPE html>
<html>
<script>
testRunner.waitUntilDone();
window.onload = () => {
  requestAnimationFrame(() => {
    requestAnimationFrame(() => {
      document.querySelector('#f').setAttribute('frameborder', '1');
      requestAnimationFrame(() => { testRunner.notifyDone(); });
    });
  });
};
</script>
<frameset cols="50%,*" rows="50%,*" border="10">
  <frame frameborder="0"></frame>
  <frame frameborder="0"></frame>
  <frame frameborder="0"></frame>
  <frameset><frame frameborder="0" id="f"></frame></frameset>
</frameset>
</html>

chromium/third_party/blink/web_tests/fast/frames/frameset-frameborder-dynamic.html