Decorative image is not defined under decorative.

Is it an issue related to Adaptive Cards?

Yes, this is related to Adaptive Card. However, it does not repro on Adaptive Cards Designer.

What is the PWD impact?

When a decorative image is not defined as decorative, screen reader users may hear unnecessary announcements like “image” or “graphic” without meaningful context. This adds noise, distracts from important information, and slows navigation.

What browsers and screen readers do this issue affect?

Windows: Edge with Windows Narrator

Are there any code-based customization done to Web Chat?

No, I am using Web Chat without any customizations except "styleOptions".

What version of Web Chat are you using?

Latest production

Which area does this issue affect?

Others or unrelated

What is the public URL for the website?

No response

How to reproduce the issue?

Repro Steps: ​

1. Open URL: Web Chat in edge browser.
   2.Ask query 'Carousel'.
2. Navigate to the cards in browse mode.
3. Observe the issue that Decorative image is not defined under decorative.

What do you expect?

Decorative image should be defined as decorative and in scan mode, screen reader focus should not move to the decorative images.

What actually happened?

Decorative image is not defined under decorative.

Do you have any screenshots or recordings to repro the issue?

https://github.com/user-attachments/assets/4bd1d022-7248-42bd-af16-13122b689f44

Did you find any DOM elements that might have caused the issue?

No response

MAS reference

No response

WCAG reference

https://www.w3.org/WAI/WCAG21/Understanding/non-text-content

WAI-ARIA reference

No response

Adaptive Card JSON

Additional context

No response

Reproduce the Carousel query in Web Chat using Edge with Windows Narrator, then navigate the cards in browse and scan modes. Inspect the rendered card images and accessibility behavior; done means decorative images are marked decorative and screen reader focus no longer moves to them.