deliteful/Toaster widget

No, it's just about clicking.

Actually I take back my suggestion to use a11yclick, I think it's more straightforward to just make the dismiss [x] and actual `<button>` node.   This is exactly what the  `<button>` node is for.

About accessibility though I'm not how a non-mouse (non-touch) user would close the popups from the keyboard.  Even if they don't need to close the popups on timers, they need some way to close the persistent popups.