<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" style="-webkit-writing-mode: vertical-rl;">
<style>
div {
position: absolute;
width: 100px;
height: 100px;
border: 3px solid black;
left: 0;
right: 0;
}
</style>
<div></div>
</html>