chromium/third_party/blink/web_tests/virtual/dark-color-scheme/button/button-hover-state.html

<!DOCTYPE html>
<meta name="color-scheme" content="dark">
<script src="../../../resources/run-after-layout-and-paint.js"></script>
<script src="../../../fast/forms/resources/common.js"></script>
<body>
<input type="button" value="button" id="pressTarget"  style="color-scheme: dark"/>
<script>
function hoverElement(element) {
  eventSender.mouseMoveTo(element.offsetLeft + 1, element.offsetTop + 1);
}

runAfterLayoutAndPaint(function() {
  var target = document.getElementById('pressTarget');
  hoverElement(target)
}, true);
</script>
</body>