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chromium/third_party/blink/web_tests/external/wpt/css/css-text/white-space/trailing-space-before-br-001.html 

<!DOCTYPE html>
<title>CSS Text: A sequence of collapsible spaces at the end of a line is removed</title>
<link rel='help' href='https://drafts.csswg.org/css-text-3/#white-space-phase-2'>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
#container > div {
  display: inline-block;
  -font-family: Ahem;
  font-size: 10px;
}
</style>
<body>
<div id=log></div>
<div id=container>
  <div>1111</div>
  <div>1111 </div>
  <div> 1111</div>
  <div> 1111 </div>
  <div>1111<br></div>
  <div>1111<br> </div>
  <div>1111 <br></div>
  <div>1111 <br> </div>
</div>
<script>
(function () {
  const epsilon = 1;
  let elements = Array.from(container.children);
  let reference = elements[0];
  let reference_width = reference.offsetWidth;
  for (let element of elements) {
    test(() => {
      assert_approx_equals(element.offsetWidth, reference_width, epsilon);
    }, escapeSpaces(element.innerHTML));
  }
})();

function escapeSpaces(text) {
  return text
    .replace(/ /g, '&#x20;')
    .replace(/\n/g, '&#x0A;')
}
</script>
</body>