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chromium/third_party/blink/web_tests/virtual/fluent-non-overlay-scrollbar/hover-over-scrollbar-thumb.html 

<!doctype html>
<!-- Tests that the thumb's color changes when hovered over. -->
<meta name="fuzzy" content="0-10;0-10">
<meta charset="utf-8">
<script src="../../resources/blink-coordinates-util.js"></script>
<script src="../../resources/gesture-util.js"></script>
<script src="../../resources/scrollbar-util.js"></script>
<script src="../../resources/testharness.js"></script>

<style>
  body,
  html {
    background-color: green;
    height: 2000px;
    margin: 0;
    width: 2000px;
  }
</style>

<script>
  window.onload = async () => {
    if (!internals) return;

    testRunner.waitUntilDone();

    const { x, y } = verticalThumb(document.documentElement);
    await mouseMoveTo(x, y);
    testRunner.notifyDone();
  };
</script>