Verify screen reader behavior on Adaptive Card

Screenshots

Version

4.12.0-0 with AC 2.5.0.

Describe the bug

While testing transcript navigation, one of the screen reader behaviors around Adaptive Cards seems off.

We would need to repro this on a page outside of Web Chat. If it still repro, will bring it to the accessibility team to verify.

Steps to reproduce

AC card should be read if the user focus into it

1. Build a plain HTML page
2. Put a button "Hello"
3. Append a AC container with a card, with at least one textblock "Aloha", followed by one button (e.g. card breakfast)
4. Run the page with screen reader
5. TAB into the first button "Hello"

• Expect: AT should narrate the content of the button, i.e. "Hello button".

1. Press TAB again and it should focus the first input element in the AC

• Expect: AT should narrate the content of the card, i.e. "Aloha".

Additional context

[Bug]

Start with the plain HTML reproduction described in the issue: place a Hello button before an Adaptive Card containing a text block and button, then test TAB navigation with a screen reader. Compare the spoken output with the stated expectations and determine whether the behavior reproduces outside Web Chat; if it does, bring the result to the accessibility team for verification.