Native browser dialogs (alert / confirm / prompt), toast notifications, timed banners and auto-closing popups.
These trigger real window.alert/confirm/prompt — handle them with your driver's alert API.
Appear top-right and auto-dismiss. Assert on [data-testid=toast].
Show a banner, then dismiss it with the ✕.
Click, wait ~2s for the popup to appear, it auto-closes after 3s. Good for wait assertions.
The message counts down and the element is removed at zero.