Version

Candidate of 4.12.0

Describe the bug

When using macOS Safari + VoiceOver, pressing up/down arrow keys while navigating the transcript, VoiceOver would narrate nothing.

Steps to reproduce

1. Turn on VoiceOver
2. Talk to MockBot for a few turns
3. Press SHIFT TAB a few times to focus on the transcript
4. Press UP arrow key for a few times

Expected behavior

While focus is put on activity being focused, VoiceOver narrate nothing.

Additional context

aria-descendant is only supported in a limited number of roles. If the element does not have role attribute, VoiceOver will not narrate when aria-activedescendant has changed.

[Bug]