[Webkit-unassigned] [Bug 250813] New: Component above video is turning gray on iOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250813

            Bug ID: 250813
           Summary: Component above video is turning gray on iOS
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: peter.m.coles at gmail.com
                CC: simon.fraser at apple.com

Created attachment 464548

  --> https://bugs.webkit.org/attachment.cgi?id=464548&action=review

Video of this issue happening

## Overview:

Content with `position: absolute` layered on top of videos is sometimes turning gray.

## Steps to Reproduce:

1) On an iPhone running iOS 16 (I am on 16.1.1) open Safari or Google Chrome (v109.0.5414.83)—I’m seeing the error on both

2) View this sample web page which autoplays a video and has white text overlayed on top: https://mrcoles.com/media/test2/superset/overlay-test/

3) View example 1 for 10 seconds and view example 2 for 10 seconds—both have the same white text overlayed on top with `color: #fff` and `position: absolute`

## Actual Results:

In example 1, the text fades from white to gray (which is very noticeable over the light video). On example 2, the text appears to remain white.

If I try to take a screen recording or screenshot, the text snaps back to white.

## Expected Results:

I expect the text to remain white in all examples.

## Build Date & Hardware: Date and hardware of the build in which you first encountered the bug.

Bug encountered on Jan 18, 2023 (have noticed for about a week now).

Safari on iOS 16.1.1

## Additional Builds and Platforms:

Bug also exists on Google Chrome v109.0.5414.83 on iOS 16.1.1

## Additional Information:

See attached video. I was unable to do a screen recording because the bug disappears when a screen recording or screenshot is in progress. The most jarring example happens after the 40-second mark in the video. Also notice the iOS swipe down dashboard appears gray too—not included but if a push notification comes through that will appear grayed out too.

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