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<!DOCTYPE html>
<meta charset="utf-8">
<title>test reference</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<style>
div {
color: transparent;
font-family: monospace;
font-size: 50px;
width: 3ch;
height: 2em;
background: green;
}
</style>
<p>Test passes if there is a single green rectangle below and no red.
<div>
</div>