Adding a video source with alpha channel information to an img element causes the alpha channel information to be lost during rendering
<rdar://96582168>
Pull request: https://github.com/WebKit/WebKit/pull/2662
Committed 252836@main (0962e25391d2): <https://commits.webkit.org/252836@main> Reviewed commits have been landed. Closing PR #2662 and removing active labels.