[Webkit-unassigned] [Bug 207256] visibilitychange event does not get always fired on background but it may on foreground

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207256

--- Comment #4 from Chris Dumez <cdumez at apple.com> ---
Likely related to process suspension on iOS. When you lock the screen or home out of Safari, our processes get suspended shortly after. As a result, we may or may not have time to fire the visibilitychange event before we get suspended. The event normally gets fired when the process resumes if it did to have time to get fired before suspension.

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