Toasts & alerts
Transient notifications and inline alerts/banners.
Toasts
IToastService — fire and forget, four severities
Inline alerts
Static, dismissible. Closer to where the user looks.
Heads up
Maintenance window starts at 23:00 UTC.
Saved
Profile updated.
Watch out
Three jobs are queued and not running.
Failure
Could not reach the data warehouse.
Banner — page level
Database read-only mode for the next 4 minutes.
Toast queue
Click a few in a row — they stack.