[Webkit-unassigned] [Bug 170131] New: [MSE] readyState doesn't open if the tab is in the background

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=170131

            Bug ID: 170131
           Summary: [MSE] readyState doesn't open if the tab is in the
                    background
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: marcilha at amazon.com

This is a bug with the Media Source Extensions and background tabs in Safari.
When attaching a new MediaSource to an Audio element source while the tab is in the background, the 'sourceopen' is never triggered.

Repro here: http://jsbin.com/hecohedugo/edit?js,console

Actual behavior:
- When a MediaSource is attached to an Audio src while the tab is in the background, the readyState is closed until the user focuses on the tab.

Expected behavior:
- When a MediaSource is attached to an Audio src while the tab is in the background, the readyState should be open.

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