Bug 212130

Summary:

iframe is flashing through overlay element

Product:

WebKit

Reporter:

Roland Soos <roland>

Component:

Compositing

Assignee:

Simon Fraser (smfr) <simon.fraser>

Status:

NEW ---

Severity:

Normal

CC:

bfulgham, mjs, romwtb, simon.fraser, webkit-bug-importer, zalan

Priority:

Keywords:

InRadar

Version:

Safari 13

Hardware:

iPhone / iPad

OS:

iOS 13

Attachments:

Description	Flags
transition flickers	none

Description Roland Soos 2020-05-20 02:19:51 PDT

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

Comment 1 Radar WebKit Bug Importer 2020-05-20 10:30:45 PDT

<rdar://problem/63453506>

Comment 2 Roman A. 2020-06-28 08:10:07 PDT

Created attachment 402995 [details]
transition flickers

Comment 3 Roman A. 2020-06-28 08:11:11 PDT

Issue are still relevant for latest webkit/safari

Comment 4 Simon Fraser (smfr) 2020-06-30 09:57:49 PDT

I can reproduce.

Aside: That carousel would feel way better using scroll snap.

Comment 5 Roman A. 2020-10-01 09:06:24 PDT

Bump