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<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CSS-contain test reference</title>
<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;
}
div {
text-orientation: upright;
}
p {
margin: auto;
padding: 150px 0;
writing-mode: horizontal-tb;
direction: ltr;
}
</style>
<div>
<p>Test passes if there is no red.
</div>