In the course of investigating T324364, it became clear that there is some work to be done to ensure popup messages use the appropriate ARIA criteria. [i]

This task involves the work of:

1. Defining what popup messages need to be updated/adjusted
2. Making the updates/adjustments necessary to ensure these messages meet the appropriate ARIA criteria

Requirements

@edeng to document

i. https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Live_Regions