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Test Info:

<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CSS-contain test: paint containment on body prevents text-orientation propagation</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
<meta name=flags content="">
<meta name=assert content="paint containment on body prevents text-orientation propagation">
<link rel="match" href="reference/contain-body-t-o-001-ref.html">
<style>
html {
writing-mode: vertical-lr;
direction: rtl;
width: 100vw;
height: 100vh;
overflow: hidden;
}
body {
margin: 0;
border-top: 100px solid red;
border-bottom: 100px solid green;
width: 100vw;
height: 100vh;
text-orientation: upright;
contain: paint;
}
p {
margin: auto;
padding: 150px 0;
writing-mode: horizontal-tb;
direction: ltr;
}
</style>
<p>Test passes if there is no red.