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 <head>
  <title>Syntax and parsing of unknown pseudo-classes</title>
  <style type="text/css">
  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>
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 <body>
 <p>This line should have a green background.</p>
</body>
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