Bug 251648 – Unable to enter fullscreen in Counterstrike (http://game.play-cs.com) in Safari 16.3

• Component: New Bugs
• Status: RESOLVED FIXED

[Saam Barati]

http://game.play-cs.com is a website to play counterstrike in the browser. It's super buggy in Safari:
- It doesn't have sound
- Fullscreen doesn't work properly. Safari is constantly entering/exiting full screen every second or so.

[Saam Barati]

(In reply to Saam Barati from comment #0)
> http://game.play-cs.com is a website to play counterstrike in the browser.
> It's super buggy in Safari:
> - It doesn't have sound
> - Fullscreen doesn't work properly. Safari is constantly entering/exiting
> full screen every second or so.

There are lots of bugs around full screen. It seems to work a bit better if you full screen Safari itself using native macOS UI. But if you press the fullscreen button in the game without full screening the macOS app, that's when I was seeing the above bug.

Now, I just encountered a different bug. If I fullscreen in the macOS Safari window UI, and then press the full screen button in the game, sometimes it'll kick me out from the desktop that Safari is full screened in, and take me back to the desktop that doesn't have Safari in it.

[Radar WebKit Bug Importer]

<rdar://problem/104984915>

[Saam Barati]

I’m seeing this in Safari 16.3

[Myles C. Maxfield]

Saam says:

"It worked properly my first time through, but playing around with entering/exiting made madness ensue. Repro might not be 100%, though whatever it is my machine seems to hit it every time now. I quit and relaunched, and that didn’t fix it."

[Tim Nguyen (:ntim)]

Created attachment 465694 [details]
Reduced testcase

Seems like a visibilitychange event is triggered when entering fullscreen, which triggers an event listener on the page that exits fullscreen.

Here is a reduced testcase.

[Andy Estes]

*** Bug 262939 has been marked as a duplicate of this bug. ***

[Andy Estes]

Re-titling to make this about the fullscreen issue. Let's track the audio issue in a new bug.

[Andy Estes]

Pull request: https://github.com/WebKit/WebKit/pull/18883

[Jer Noble]

Hi Saam! Aside from Andy's PR, why is play-cs.com exiting fullscreen when visibility changes? That means users can't switch spaces in Mac fullscreen without their game exiting. That's super annoying!

[Jer Noble]

For the audio issue, if play-cs.com makes use of WebAudio, this commit may interest you: https://commits.webkit.org/268047@main

[Andy Estes]

Filed https://bugs.webkit.org/show_bug.cgi?id=262963 to track the audio issue.

[EWS]

Committed 269150@main (7e8c765bf94d): <https://commits.webkit.org/269150@main>

Reviewed commits have been landed. Closing PR #18883 and removing active labels.