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<!DOCTYPE html>
<meta charset="utf-8">
<style>
[interestfor]::before { content: 'BEFORE'; border: 1px solid lime; }
[interestfor]::after { content: 'AFTER'; border: 1px solid lime; }
[interestfor]::interest-button { content: 'INTEREST'; }
</style>
<div id="examples">
<a href="#" interestfor="target"><span>Link</span></a>
<div id="target"></div>
</div>