[Webkit-unassigned] [Bug 245612] New: Quirks mode breaks native video controls in YouTube embeds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245612

            Bug ID: 245612
           Summary: Quirks mode breaks native video controls in YouTube
                    embeds
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: opendarwin at lapcatsoftware.com

Created attachment 462575

  --> https://bugs.webkit.org/attachment.cgi?id=462575&action=review

Sample html demonstrating the bug

This bug occurs in Safari on iOS/iPadOS 16 and 15.

Steps to reproduce:
1) Open the attachment index.html in Mobile Safari
2) Press the YouTube play button to start the video
3) Press the native pause button to pause the video
4) Press the native play button to play the video again

Expected results:
The native video controls remain on the screen for a few seconds, and after they disappear, you can bring them back by touching the video.

Actual results:
The native video controls disappear immediately after pressing play, and when you touch the video, the native controls appear momentarily and disappear immediately. It's extremely difficult to get the native controls to stay on the screen.

If you open the Safari web inspector, disable Site-specific Hacks, and reload the page, then everything works as expected again.

I'm still trying to determine exactly which quirk is causing this, but there are a couple that look relevant:
https://github.com/WebKit/WebKit/blob/main/Source/WebCore/page/Quirks.cpp

This bug is relevant to me because I have an iOS Safari extension that shows the native video controls on sites, and the Safari quirk breaks the feature for YouTube embeds. If you know of a workaround I could use that doesn't involve disabling Site-specific Hacks, I would appreciate it.

Related: For some reason, another Safari quirk is to make YouTube videos show iOS 15 style video controls on iOS 16 unless the URL has the search parameter showinfo=0. This seems strange.

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