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chromium/third_party/blink/web_tests/external/wpt/css/css-ui/outline-style-inherit-ref.html 

<!doctype html>
<meta charset="utf-8">
<title>CSS Test Reference</title>
<style>
  div { width: 100px; height: 100px }
</style>
<div style="outline-style: solid; outline-color: green"></div>