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<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Operators</h1>
<h2>The void Operator</h2>
<p>
<a href="javascript:void(0);">Useless link</a>
</p>
<p>
<a href="javascript:void(document.body.style.backgroundColor='red');">
Click me to change the background color of body to red.</a>
</p>
</body>
</html>