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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/crashtests/fieldset-middleclick.html 

<!DOCTYPE HTML>
<html class="test-wait">
<head>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<style>
#f {
  overflow-y: scroll;
  width: 100px;
  height: 100px;
}
</style>
</head>
<body>
<fieldset id="f">
  <p>test</p>
  <p>test</p>
  <p>test</p>
  <p>test</p>
  <p>test</p>
  <p>test</p>
</fieldset>
<script>
onload = async () => {
  const actions = new test_driver.Actions();
  const button = {button: actions.ButtonType.MIDDLE};
  await actions.
      pointerMove(50, 50).
      pointerDown(button).
      pointerUp(button).
      send();
  document.documentElement.className = "";
};
</script>
</body>
</html>