<?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>