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chromium/third_party/blink/web_tests/external/wpt/css/css-grid/grid-model/grid-item-hit-test.html 

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1029371">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div style="display: grid;">
  <div style="height: 100px;">
    <div style="float: left; width: 50%; height: 400px; background: hotpink;"></div>
  </div>
  <div id="target" style="height: 100px; background: cyan;"></div>
</div>
<script>
test(() => {
  assert_equals(document.elementFromPoint(150, 150), document.getElementById('target'));
});
</script>