<!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>:before pseudo-element</title>
  <style type="text/css"><![CDATA[p:before { background-color : lime ; content : "GENERATED CONTENT "}
]]></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 -->
  <meta name="flags" content="" />
 </head>
 <body>
<p>You should see before this paragraph the words GENERATED CONTENT over green background</p>
</body>
</html>