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chromium/third_party/blink/web_tests/cssom/elementfrompoint.html 

<!DOCTYPE html>
<title>Test that document.elementFromPoint supports "double" arguments.</title>
<style>
    body { margin: 0; }
</style>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<div style="width: 100.25px;">abc</div>
<script>
test(function() {
  var divElement = document.querySelector("div");

  // Test that elementFromPoint hits div element.
  assert_equals(document.elementFromPoint(100.249, 12), divElement);

  if (window.testRunner) {
    // Page zoom factor should not affect result.
    testRunner.setPageZoomFactor(3.0);
    assert_equals(document.elementFromPoint(100.249, 12), divElement);

    testRunner.setPageZoomFactor(4.0);
    assert_equals(document.elementFromPoint(100.249, 12), divElement);
  }
});
</script>