Timed undo

Delete button that becomes its own ten-second undo

A delete account button that gives you ten seconds to change your mind. Press it and the button goes pale, the label rewrites to Cancel Deletion letter by letter, and a countdown starts.

I prefer this to a modal: the undo lands where your cursor already is, and a confirm dialog asks you to predict regret while an undo lets you notice it. The border radius is set inline because a layout animation skews a radius it is interpolating.