What type of issue is this?
Incorrect support data (example: BrowserX says "86" but support was added in "40")
What information was incorrect, unhelpful, or incomplete?
The table states that Firefox Nightly supports an options object as a parameter to startViewTransition.
It does only accept the update callback (Level 1 of the API), but not yet the Level 2 options object with update and types.
What browsers does this problem apply to, if applicable?
Firefox
What did you expect to see?
Red "X NO" in the row saying "callbackOptions parameter" for Firefox
Did you test this? If so, how?
devTools console: run
document.startViewTransition({update: async () => {}})
Firefox Nightly 143.0a1 replies:
"Uncaught TypeError: Document.startViewTransition: Argument 1 is not callable."
Can you link to any release notes, bugs, pull requests, or MDN pages related to this?
No response
Do you have anything more you want to share?
I'd open a PR too, but don't want to jump in uninvited.
Also totally fine if I'm wrong and Firefox directly ships Level 2 😊.
MDN URL
https://developer.mozilla.org/en-US/docs/Web/API/View_Transition_API
MDN metadata
MDN page report details
- Query:
api.Document.startViewTransition
- Report started: 2025-08-15T23:10:41.643Z
What type of issue is this?
Incorrect support data (example: BrowserX says "86" but support was added in "40")
What information was incorrect, unhelpful, or incomplete?
The table states that Firefox Nightly supports an options object as a parameter to
startViewTransition.It does only accept the update callback (Level 1 of the API), but not yet the Level 2 options object with update and types.
What browsers does this problem apply to, if applicable?
Firefox
What did you expect to see?
Red "X NO" in the row saying "callbackOptions parameter" for Firefox
Did you test this? If so, how?
devTools console: run
Firefox Nightly 143.0a1 replies:
"Uncaught TypeError: Document.startViewTransition: Argument 1 is not callable."Can you link to any release notes, bugs, pull requests, or MDN pages related to this?
No response
Do you have anything more you want to share?
I'd open a PR too, but don't want to jump in uninvited.
Also totally fine if I'm wrong and Firefox directly ships Level 2 😊.
MDN URL
https://developer.mozilla.org/en-US/docs/Web/API/View_Transition_API
MDN metadata
MDN page report details
api.Document.startViewTransition