[Webkit-unassigned] [Bug 189600] New: Blocked autoplaying audio plays unexpectedly on visibilityState change

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189600

            Bug ID: 189600
           Summary: Blocked autoplaying audio plays unexpectedly on
                    visibilityState change
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jer.noble at apple.com

Created attachment 349687

  --> https://bugs.webkit.org/attachment.cgi?id=349687&action=review

two-audio-element-autoplay.html

On Mac Safari, when two media elements in a page both have "autoplay" attributes, and one element has its play() method called during a user gesture, the play restrictions for every media element in the page is lifted. The next time the "eligible for autoplay" check is made, the previously blocked element begins playing unexpectedly.

This is fallout from our compatibility decision to unblock autoplay at a page level once one element is unblocked due to a user gesture.

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