select_event_remove_frame_on_change.html

<!DOCTYPE html>
<html>
<body>
<iframe srcdoc="<select><option>1</option><option>2></option></select>"></iframe>
<script>
const frame = document.querySelector('iframe');
onload = function() {
  frame.contentDocument.querySelector('select').onchange = () => { frame.remove(); };
};
</script>
</body>
</html>

chromium/third_party/blink/renderer/core/testing/data/popup/select_event_remove_frame_on_change.html