WCAG 2.1 - SC 4.1.3 Status Messages

Summary:

When new status content is added to a web page without changing the user’s context, users should be made aware of the important changes in content that are not given focus in a way that doesn’t unnecessarily interrupt their work. The messages to the users should be programmatically determinable through a role and / or properties. This is especially beneficial for users who are blind, have low vision, or users with cognitive or learning disabilities that use assistive technology with screen reading capabilities.

A status message is defined as “providing information to the user on the success or results of an action, on the waiting state of an application, on the progress of a process, or on the existence of errors.”