api.InputDeviceInfo - `InputDeviceInfo` not available in Firefox

[Nearoo]

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?

InputDeviceInfo is supposed to be part of baseline. According to the docs, it should be available in Firefox, except for the method getCapabilities(). However, it's no available at all - Firefox doesn't know this symbol.

What browsers does this problem apply to, if applicable?

Firefox

What did you expect to see?

The table should say: Not available in firefox.

Did you test this? If so, how?

Tested here on Firefox https://jsfiddle.net/6x3dr7hL/ says InputDeviceInfo is not defined

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?

Tried in FF v 141 on:

• Nix OS
• MacOS
• Ubuntu

Also tried in localhost. All the same. Compat tables shows supported since FF 39.

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/InputDeviceInfo

MDN metadata

MDN page report details

• Query: api.InputDeviceInfo
• Report started: 2025-08-05T10:49:33.467Z

[Josh-Cena]

InputDeviceInfo is only promoted to an interface from a dictionary with the introduction of getCapabilities. Because Firefox does not implement this method, it stays as a dictionary in Firefox. We don't have a process for documenting switches between dictionaries and interfaces, but ig we can note FF as partial_implementation at least.

[Nearoo]

Sounds good, should I make a PR?

Question though, if neither the symbol InputDeviceInfo, nor any property or methods are available, couldn't you argue that from a programmer perspective, the situation is indistinguishable from "not implemented at all"? After all, the interface/type's purpose seems to be to provide access to capabilities. https://w3c.github.io/mediacapture-main/#dom-inputdeviceinfo