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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/hittest-anonymous-box.html 

<!DOCTYPE html>
<link rel="help" href="https://crbug.com/1097654" />
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#target {
  font: 20px/1 Ahem;
  display: flex;
  flex-direction: column;
  border: 2px solid black;
  width: 100px;
  height: 100px;
}
</style>
<div id=target>X</div>
<script>
test(function(t) {
  const target = document.getElementById('target');
  assert_equals(target, document.elementFromPoint(30, 10));
}, 'Hit-testing within an anonymous flex-item should return the flexbox as the hittest result.');
</script>