To reproduce the bug, navigate to the URL, click Faces at the top, then scroll horizontally to one of the animated watch faces, such as the Minnie Mouse face. As the watch face is animating, “video interference” appears on top of it.
Caused by <https://trac.webkit.org/r213764>, the change made for bug 165039.
<rdar://problem/31263139>
I was told that this is a duplicate of bug 169771.
Yes it a duplicate. The animated watch faces are images drawn on a canvas. This is covered by bug 169771. *** This bug has been marked as a duplicate of bug 169771 ***