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chromium/third_party/blink/web_tests/virtual/text-antialias/content-following-inline-isolate-with-collapsed-whitespace.html 

<!DOCTYPE html>
<body>
<p><span data-expected-width="80" id="test">123
 <span style="unicode-bidi: -webkit-isolate">456</span> 789</span></p>
<script src="../../resources/check-layout.js"></script>
<script>
checkLayout('#test');
</script>