lol_html 1.2.1

Streaming HTML rewriter/parser with CSS selector-based API
Documentation 
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<!DOCTYPE html><html><head>
  <title>NEGATED :lang() pseudo-class</title>
  <style type="text/css">div.stub * { background-color : red  }
div.stub *:not(:lang(fr)) { background-color : green }</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>
<div lang="en" class="stub">
<p>This paragraph should have a green background because the
   enclosing div is in english.</p>
<p lang="en">This paragraph should have a green background because
   it is in english.</p>
<div lang="fr">
  <p lang="en">This paragraph should have a green background
     because it is in english.</p>
</div>
</div>

</body></html>