Snackbar

Snackbar delivers lightweight, transient feedback—save confirmations, background-job completions, non-blocking errors—without stealing focus the way a Dialog does. Position and duration should respect operator concentration; stack height must stay manageable in incident-heavy shifts where a dozen events might fire in a minute. The mental model is "short acknowledgement that disappears on its own"; if the message must be seen until resolved, reach for Banner instead. Do Don't Timed dismissal should not remove critical messages before screen reader users can reach them—extend duration or persist the message for important Error types per policy. Action links must be keyboard focusable. See Accessibility for the full contract.