chromium/third_party/blink/web_tests/external/wpt/css/CSS2/floats/hit-test-floats-003.html

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://www.w3.org/TR/CSS22/visuren.html#floats">
<link rel="help" href="https://www.w3.org/TR/CSS22/zindex.html">
<div id="target" style="width:100px; height:100px;">
  <div id="error" style="float:left; position:relative; z-index:-1; width:100px; height:100px;"></div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  test(()=> {
      var elm = document.elementFromPoint(50, 50);
      assert_equals(elm.id, "target");
  }, "Miss float below something else");
</script>