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chromium/third_party/blink/web_tests/external/wpt/css/selectors/old-tests/css3-modsel-37.xml 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>:only-of-type pseudo-class</title>
  <style type="text/css"><![CDATA[.red { background-color : red }
.t1 :only-of-type { background-color : lime }
]]></style>
  <link rel="author" title="Daniel Glazman" href="http://glazman.org/"/>
  <link rel="help" href="https://www.w3.org/TR/css3-selectors/#selectors"/> <!-- bogus link to make sure it gets found -->
 </head>
 <body>
<div class="t1">
<p>This paragraph should have normal background</p>
<address class="red">But this address should have green background</address>
<p>This paragraph should have normal background</p>
</div>
</body>
</html>