<!doctype html PUBLIC "HTML 4.0.1 Strict" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html>
<head>
  <title>Concat css example</title>
  <link rel="stylesheet" href="a.css+b.css.pagespeed.cc.0.css" type="text/css"/>
  
</head>
<body><div class="c1"><div class="c2"><p>
  Yellow on Blue
</p></div></div></body>
</html>