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chromium/third_party/blink/web_tests/virtual/text-antialias/hyphens/hyphens-auto.html 

<!DOCTYPE html>
<style>
div {
  border: thin solid black;
  -webkit-hyphens: auto;
  hyphens: auto;
  width: 5ch;
}
</style>
<div lang="en-us">a hyphenation test</div>