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<!DOCTYPE html>
<html>
<head>
<style>
li:first-child {
  background: yellow;
} 
</style>
</head>
<body>
<h1>Demo of :firstchild</h1>
<ul>
  <li>Coffee</li>
  <li>Tea</li>
  <li>Coca Cola</li>
</ul>
<ol>
  <li>Coffee</li>
  <li>Tea</li>
  <li>Coca Cola</li>
</ol>
</body>
</html>