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<!DOCTYPE html>
<html>
<body>

<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>

<!DOCTYPE html>
<html>
<body>


<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>