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<html>
<meta chartset=utf-8>
<title>Test Reference</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
<style>
html {
writing-mode: vertical-rl;
}
body {
writing-mode: vertical-rl;
width: 0; height: 0;
}
html::before {
content: "This text must be vertical.";
}
html::after {
content: "This text must be horizontal.";
display: block;
writing-mode: horizontal-tb;
}
</style>
<body></body>