Since content under the container needs to fade, augmenting the container with ::before and ::after needs to have the fade animations baked in for new media controls subclasses to be able to use those pseudo-elements.
Pull request: https://github.com/WebKit/WebKit/pull/1776
Committed 251863@main (9fd7b9016b84): <https://commits.webkit.org/251863@main> Reviewed commits have been landed. Closing PR #1776 and removing active labels.
<rdar://problem/95961994>