[Webkit-unassigned] [Bug 175748] New: Autoplay Muted Videos Don't Play When Outside Viewport

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175748

            Bug ID: 175748
           Summary: Autoplay Muted Videos Don't Play When Outside Viewport
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: neil.here at gmail.com

Created attachment 318565

  --> https://bugs.webkit.org/attachment.cgi?id=318565&action=review

Webarchive of mentioned test case.

I have various <video autoplay loop muted playsinline> on a single page, on iOS 11 (15A5354b, iPhone and iPad) only the videos that are within the viewport automatically play.

A test case exists at this page: https://www.fomopop.com/html5-video-test/ (a webarchive is attached as well, for posterity). If you view on an iPhone running iOS 10.x, all 5 of the videos will play. On an iPhone running iOS 11 (15A5354b), only the first 2 videos will play.

This might be related to https://bugs.webkit.org/show_bug.cgi?id=170610 , but I'm not sure if that's in a public iOS build yet.

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