The outline on inline elements does not rotate with the logical dimensions when writing-mode is set to vertical (either vertical-lr or vertical-rl). Margin, on the other hand, works fine. Reproducible code: https://jsbin.com/jadigefowi/edit?html,css,output
<rdar://problem/93727075>
I am able to reproduce this bug in WebKit ToT (267474@main) where the 'outline' is horizontal and don't respect 'writing-mode' as 'vertical'. Adding 'BrowserCompat' tag since it works fine in Chrome Canary 118 and Firefox Nightly 118.