Created attachment 471444 [details] Screen recording ...
<rdar://problem/128405732>
Created attachment 471457 [details] Test reduction Looks like `margin: auto` + `width` on `:root` don't play well with VT.
Pull request: https://github.com/WebKit/WebKit/pull/28887
Committed 279372@main (2058eceb3fd5): <https://commits.webkit.org/279372@main> Reviewed commits have been landed. Closing PR #28887 and removing active labels.