<!DOCTYPE html>
<html><body>
	There should be a blue block at the center of a black border.
<div style="-webkit-writing-mode: vertical-rl; border: solid 5px black">
  <div style="float: left; margin: 50px; width: 50px; height: 50px; background-color: blue;">
  </div>
</div>
</body></html>