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When a page displays a notification, additionally "draws attention" to the containing window.

The exact effect of this extension is platform-specific. To quote the used (formerly-public) function's documentation:

> On Windows, the taskbar button for the window flashes, if this hasn't been disabled by the user.
>
> On Linux, the behaviour varies from window manager to window manager - some flash the taskbar button, others focus the window immediately. This may be configurable as well.
>
> On Macintosh, the icon in the upper right corner of the desktop flashes.

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