https://github.com/whatwg/fullscreen/pull/210 is updating the Fullscreen UA style sheet to use the inset property instead of top/right/bottom/left. This change isn't observable or testable, but it would still be good to align implementations, as it makes the style sheet marginally smaller and faster to parse.
<rdar://problem/102705230>
Pull request: https://github.com/WebKit/WebKit/pull/6848
Committed 257058@main (f238b05eff07): <https://commits.webkit.org/257058@main> Reviewed commits have been landed. Closing PR #6848 and removing active labels.