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<!doctype html>
<!--
Any copyright is dedicated to the Public Domain.
-->
<html><head>
<meta charset="utf-8">
<title>Reference: content:none on a :root flex</title>
<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1699964">
<style>
html,body {
padding:0; margin:0;
}
body {
display: flex;
border: 1px solid;
gap: 10px;
}
</style>
</head>
<body><x>B</x><x>A</x></body>
</html>