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<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CSS-contain test referemce</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
<style>
html, body, p, div {
margin: 0;
width: 200px;
height: 200px;
}
</style>
<p>Test passes if there is no red.