[Webkit-unassigned] [Bug 241756] New: Safari on iOS can overlap multiple full-screen videos

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=241756

            Bug ID: 241756
           Summary: Safari on iOS can overlap multiple full-screen videos
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: Unspecified
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mazzarolomatteo at gmail.com

Created attachment 460334

  --> https://bugs.webkit.org/attachment.cgi?id=460334&action=review

Bug preview (video)

Hi. I recently discovered (by mistake) a potentially irritating behavior of Safari on iOS: full-screen videos can overlap each other. This behavior can be exploited by websites for distrupting the user experience and, in some cases, crash the Safari app (or the app embedding the Safari webview). 

All it takes for a website to show multiple videos in full screen is to use JavaScript to invoke the HTMLMediaElement.play() method on multiple video elements after a user interaction. 

I create a web page you can use to reproduce the issue at: https://mmazzarolo.com/safari-mobile-annoying-full-screen-videos/

I used the following setup to reproduce the behavior: 
iPhone 13 Pro | iOS 15.5 | Safari 15

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