<!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>Syntax and parsing of unknown pseudo-classes</title>
  <style type="text/css"><![CDATA[
  p { background: lime; }
  p:subject { background: red; } /* this is not valid CSS, and if UAs
  implemented the experimental :subject pseudo-class they should have
  used the :-vnd-ident syntax. */
]]></style>
  <link rel="author" title="Ian Hickson" href="mailto:ian@hixie.ch"/>
  <link rel="help" href="https://www.w3.org/TR/css3-selectors/#selectors"/> <!-- bogus link to make sure it gets found -->
  <link rel="match" href="reference/this-line-lime-background.xht"/>
  <meta name="flags" content="" />
 </head>
 <body>
 <p>This line should have a green background.</p>
</body>
</html>