The `display` property has been made animatable as a discrete property: https://drafts.csswg.org/css-display-4/#the-display-properties https://drafts.csswg.org/css-display-4/#display-animation
Pull request: https://github.com/WebKit/WebKit/pull/22974
<rdar://problem/121662911>
*** Bug 270972 has been marked as a duplicate of this bug. ***
Pull request: https://github.com/WebKit/WebKit/pull/26187
Disregard the various pull requests for this patch, there will not be a code change here, this is just an umbrella bug for the various subtasks marked as blockers.
All subtasks are complete, this feature is now complete.