The difference between alerts and banners is that alerts require user input to disappear, whereas banners go away on their own. Is there a way to close all notification alerts at once?
In the example below, there are 6 alerts from one application. I'd like to be able to OPTION-click "Close" or hit a keyboard shortcut to dismiss all of them. Ideally, I'd be able to dismiss all alerts on a per application basis. But I'd settle for the ability to dismiss alerts universally.