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chromium/third_party/blink/web_tests/external/wpt/css/css-grid/grid-tracks-fractional-fr.html 

<!DOCTYPE html>
<title>Tests fractional fr-units which should multiply to whole numbers.</title>
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1515685">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="target" style="display: grid; grid-template-columns: 1.01fr 0.99fr 1fr; width: 600px;">
  <div></div>
  <div></div>
  <div></div>
</div>
<script>
test(() => {
  const [a, b, c] = document.getElementById('target').children;
  assert_equals(a.getBoundingClientRect().width, 202);
  assert_equals(b.getBoundingClientRect().width, 198);
  assert_equals(c.getBoundingClientRect().width, 200);
});
</script>