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

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<style>
legend:hover {
  background: lime;
}
</style>
<h1>Header</h1>
<fieldset>
  <legend>Legend</legend>
</fieldset>
<script>
// https://crbug.com/1127743
promise_test(async () => {
  await test_driver.click(document.querySelector('legend'));
  assert_not_equals(document.querySelector('legend:hover'), null);
}, 'The rendered LEGEND should work well for :hover.');
</script>