lol_html 1.2.1

Streaming HTML rewriter/parser with CSS selector-based API
Documentation 
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<html><head>
  <title>:only-child pseudo-class</title>
  <style type="text/css">.red { background-color : red }
p:only-child { background-color : lime }
div.testText > div > p { margin-left : 1em }
</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>This paragraph should have normal background</p>
<div>This div contains only one paragraph
    <!--[ELEMENT('p:only-child')]--><p class="red"><!--[TEXT('p:only-child')]-->This paragraph should have green background<!--[/TEXT('p:only-child')]--></p><!--[/ELEMENT('p:only-child')]-->
</div>

</body></html>