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chromium/third_party/blink/web_tests/external/wpt/css/css-ui/text-overflow-017.html 

<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>CSS Basic User Interface Test: interacting with the ellipsis</title>
<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
<link rel="help" href="http://www.w3.org/TR/css3-ui/#text-overflow">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<meta name="assert" content="Ellipsing must not prevent dispatching of pointer events.">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
#test {
  overflow: hidden;
  text-overflow: ellipsis;
  margin-left: -100px;
  width: 2.5em;
  height: 1em;
  white-space: pre;
  font: 100px/1 Ahem;
  color: blue;
}
#desc {
  float: left;
}
</style>

<div id="desc">First, click the blue box. </div>
<div id="test">   </div>
<script>

let test = document.getElementById("test");

promise_test(async t => {
  await document.fonts.ready;

  let clicked = false;
  test.addEventListener("click", () => {
    clicked = true;
  });

  await test_driver.click(test);

  assert_true(clicked);
});

</script>