Announce dynamic updates

A polite status reports successful registration; validation errors use the form error pattern rather than a stream of competing alerts. That contrast gives us something useful to test instead of a rule to memorize.

Live regions can reveal updates that do not move focus, but priority, timing, and changed text affect what is announced. The useful target is not encyclopedic coverage. Make one deliberate choice, observe its consequences, and know which requirement would make you revise it.

The happy path can hide a bad design: you can wrap the whole application in an assertive live region and still get one successful demo. Push past the demo. announce concise outcome changes, initialize regions predictably, and avoid duplicating information already reached by focus, then test the condition most likely to prove the choice wrong.

The module is moving toward one outcome: Use ARIA and dynamic announcements only where native HTML cannot express the required relationship or state. Save the before-and-after evidence now; it will make the final project review much more honest.

Test success, loading, validation, and network failure announcements and count what is spoken. Save the evidence, then explain which requirement would force you to choose a different design.