| <!DOCTYPE HTML> | |
| <title> Ensure element is centered by auto margin for orthogonal writing mode </title> | |
| <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/3973"> | |
| <link rel="match" href="div-orthogonal-auto-margin-ref.html"> | |
| <style> | |
| #outer { | |
| inset: 0; | |
| background-color: black; | |
| writing-mode: vertical-rl; | |
| margin: auto; | |
| position: absolute; | |
| block-size: max-content; | |
| inline-size: 100px; | |
| border: 5px solid red; | |
| } | |
| </style> | |
| <div id="outer"><div style="block-size: 200px;"></div></div> |