Toasts should not be visually hidden if they are not being used. If you do not want a screen reader to pick up a toast, use the aria-hidden='true' HTML attribute and/or {display: none;} in your CSS.
When constructing a toast message, consider how it will be read by a screen reader:
Write out dates, e.g., December 1, 2018 and not 12/1/2018.
Avoid non-text symbols like “/” and “+”.
When describing a date or time range use “to” instead of “–”.
Toasts should be used sparingly and only in instances that warrant removing the user from their current task. Too many toasts can be disorienting to users with cognitive issues.
