lol_html 1.2.1

Streaming HTML rewriter/parser with CSS selector-based API
Documentation 
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<!DOCTYPE html><html><head>
  <title>:before pseudo-element</title>
  <style type="text/css">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>