<!DOCTYPE html>
<html>
<body>
<p elementtiming='text'>Text</p>
<script>
  const observer = new PerformanceObserver(entryList => {
    window.parent.triggerTest(entryList.getEntries()[0]);
  });
  observer.observe({type: 'element', buffered: true});
</script>
</body>
</html>
