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chromium/third_party/blink/web_tests/external/wpt/css/css-ui/reference/outline-021-notref.html 

<!doctype html>
<meta charset=utf-8>
<title>CSS test reference</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://mozilla.org">

<input type="submit" style="outline: none">