One toast at a time
one-toast-at-a-time
One toast at a time — consecutive/simultaneous toasts follow a priority queue; do not stack multiple visible toasts.
Description
Toast feedback must stay readable: Spectrum allows only one toast on screen while consecutive or simultaneous messages wait in a priority queue. Stacking several visible toasts crowds the viewport and makes status hard to parse. Keep confirmations and simple notifications in that single-toast lane; escalate situations that need attention or a response to a dialog instead of piling more toasts.
When to use
System confirmations and low-priority alerts after saves or uploads.
Not when
Dialogs that need a response, or sitewide static banners and alerts.
Agent hint
Show one toast at a time; queue the rest by priority instead of stacking.
Only one toast is visible; others wait in a priority queue.
Multiple toasts stacked/visible at once.
Citations
Spectrum — Toast
https://spectrum.adobe.com/page/toast/