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chromium
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chromium/third_party/blink/web_tests/external/wpt/html/semantics/links/linktypes/alternate-css.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Alternate css</title>
<link rel="match" href="alternate-css-ref.html">
<link rel="stylesheet"           href="preferred.css" title="preferred">
<link rel="alternate stylesheet" href="alternate.css" title="alternate">
<div>foobar</div>