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chromium/third_party/blink/web_tests/external/wpt/css/css-overflow/overflow-clip-margin-hit-testing.html 

<!doctype html>
<title>Overflow: clip hit testing includes overflow in overflow-clip-margin</title>
<link rel="help" href="https://www.w3.org/TR/css-overflow-3/#valdef-overflow-clip">
<link rel="author" title="Scott Violet" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="container" style="width: 100px; height: 100px;
                           overflow: clip; overflow-clip-margin: 50px">
  <div id="child" style="width: 300px; height: 50px"></div>
</div>

<script>
test(() => {
  var bounds = container.getBoundingClientRect();
  assert_equals(child, document.elementFromPoint(bounds.x + 50, bounds.y + 20),
                'in child and container');
  assert_equals(child, document.elementFromPoint(bounds.x + 125, bounds.y + 25),
                'in child and container overflow clip margin');
  assert_equals(document.body, document.elementFromPoint(bounds.x + 175, bounds.y + 25),
                'outside of container overflow, would in child without clip');
  assert_equals(container, document.elementFromPoint(bounds.x + 50, bounds.y + 75),
                'outside of child, in container');
  assert_equals(document.documentElement,
                document.elementFromPoint(bounds.x + 50, bounds.y + 125),
                'in container overflow clip margin, but nothing there');
}, "Ensure elements in overflow-clip-margin are returned from elementFromPoint");
</script>