Aria-live for error messages (aria-live)
Error messages that appear dynamically after form validation must be placed inside an ARIA live region, so that assistive technologies announce them without requiring focus.
Search results without status role:
This example fails WCAG 4.1.3 because the search results are updated dynamically, but the result message is not in an ARIA live region. A screen reader user would not know the result has appeared unless they manually navigate to it.