[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 #1 from Alexander Cerutti <cerutti.alexander at gmail.com> ---
Created attachment 389818

  --> https://bugs.webkit.org/attachment.cgi?id=389818&action=review

Repro html page

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