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chromium/third_party/blink/web_tests/external/wpt/css/cssom-view/CaretPosition-001.html 

<!DOCTYPE html>
<html>
<head>
<title>CSSOM View Module test:CaretPosition</title>
<link rel="author" title="unbug" href="mailto:[email protected]" />
<link rel="help" href="https://drafts.csswg.org/cssom-view-1/#dom-document-elementfrompoint">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style type="text/css">
.box{
  position: absolute;
  top : 100px;
  left : 400px;
  width: 100px;
  height: 100px;
  background-color: #000;
}
</style>
</head>
<body>
<div id="box" class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div id="box2" class="box"></div>
<div id="box3" class="box" style="left: 405px;background:red;"></div>
<div id="log"></div>
<script>
test(function(){
  assert_equals(document.elementFromPoint(400, 100),
                document.getElementById('box2'),
                "Expected value for element id is 'box2'");
}, 'Element at (400, 100)');

test(function(){
  assert_equals(document.elementFromPoint(400, 900),
                null,
                "Expected value for element id is 'box2'");
}, 'Element at (400, 900)');
</script>
</body>
</html>