Steps to reproduce: 1. Open https://smartslider3.com/bugs/webkit/iframeflash2/ on iPhone 2. Swipe your finger to the left 3. Watch the animation Sometimes the iframe(YouTube embed) flickers through the covering image. Screen recording: https://www.youtube.com/watch?v=MgFmKVnDBrA Happens at 0:07 and 0:09 Also a very similar issue, but I was not able to reproduce in a test environment, but I'm sure it is related. Watch this screen recording: https://www.youtube.com/watch?v=fyXZBhZdxlY While I drag my finger on the screen at 0:03, the overlay image is invisible for a while and you can see the YouTube embed. This gets fixed after some point at 0:06 then it does not happen until the next drag. If I added the following CSS to the overlay element, then this issue gets fixed. .n2_ss_video_player__cover { transform: translate3d(0, 0, 0); } IOS 13.4.1
<rdar://problem/63453506>
Created attachment 402995 [details] transition flickers
Issue are still relevant for latest webkit/safari
I can reproduce. Aside: That carousel would feel way better using scroll snap.
Bump