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<!doctype HTML>
<html>
<meta charset="utf8">
<title>Content Visibility: hidden video (reference)</title>
<link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com">
<style>
div {
width: 200px;
height: 200px;
background: green;
border: 1px solid black;
}
</style>
<div></div>