lol_html 1.2.1

Streaming HTML rewriter/parser with CSS selector-based API
Documentation 
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<html><head>
  <title>NEGATED :focus pseudo-class</title>
  <style type="text/css">a:not(:focus) { background-color: transparent; }
a { background-color: lime; }
</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=" interact">
 </head>
 <body>
<p>The background color of all <a href="#foo">anchors</a>
  should become <a href="#foo"> green</a> when they have the
  <a href="#foo">focus</a>.</p>

</body></html>