`webdriver.bidi.session.new` - multiple sessions should have a behavioral subfeature

What type of issue is this?

Missing compatibility data

What information was incorrect, unhelpful, or incomplete?

The MDN page talks about multiple sessions and their support:

In browsers that don't support multiple sessions (e.g., Firefox), sending session.new when a session is already active results in an error response […]

The compat table doesn't reflect this.

What browsers does this problem apply to, if applicable?

Chromium (Chrome, Edge 79+, Opera, Samsung Browser), Firefox

What did you expect to see?

A subfeature showing whether a browser can support multiple sessions with WebDriver BiDi.

Did you test this? If so, how?

https://github.com/mdn/browser-compat-data/pull/29972 dropped the note about multiple sessions. The linked bug, https://bugzil.la/1862018, is still open.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

• https://bugzil.la/1862018
• Previously: https://github.com/mdn/browser-compat-data/pull/29972
• Elsewhere: https://github.com/web-platform-dx/web-features/pull/2777#issuecomment-3073660917

Do you have anything more you want to share?

No response

MDN URL

No response

MDN metadata

No response

Start with the existing webdriver.bidi.session.new compatibility data and compare it with the MDN section on attempting to create an already-active session. Review bug 1862018 and the linked compatibility discussion for browser support, then validate the new behavioral subfeature against the repository's data checks. Done means the compat table represents multiple-session support for the listed browsers.