Toasts
Short messages that appear after something you did, without taking focus. Surveyed from DICOM Viewer (see docs/SCOPE.md, Phase 18). The rules are the point: errors and anything with an action stay until you dismiss them, the others fade after 10 seconds and wait while you point at them or tab into them, Escape dismisses the focused one, and the messages are announced by live regions that exist from page load.
Try them
Without JavaScript the same messages arrive as the flash banners at the top of the page, which is also the right place for anything a person must act on.
Rules
- Errors and toasts with an action never time out.
- Others fade after 10 seconds, paused while hovered or focused.
- Escape or the Dismiss button closes one; focus returns to the button you used.
- At most three at once.
- No slide or fade with reduced motion.