css/selectors/remove-hovered-element.html

<!doctype html>
<html class="reftest-wait">
<title>Selectors: :hover style cleared on ancestor when hovered element is removed.</title>
<link rel="help" href="https://drafts.csswg.org/selectors/#the-hover-pseudo">
<link rel="match" href="remove-hovered-element-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<style>
  div {
    width: 100px;
    height: 100px;
    background: green;
  }
  #outer:hover {
    background-color: red;
  }
  #relative {
    position: relative;
    left: 150px;
  }
</style>
<p>Clicking the right square should make the left one go green.</p>
<div id="outer">
  <div id="relative"><div id="inner">Click me</div></div>
</div>
<script>
  inner.addEventListener("click", () => {
    relative.style.display = "none";
    // force layout box removal
    document.body.offsetTop;
    relative.remove();
    takeScreenshot();
  });

  // Hover #inner and click.
  var actions = new test_driver.Actions();
  actions.pointerMove(0, 0, {origin: inner}).pointerDown().pointerUp().send();
</script>