Re: [w3c/gamepad] id field in gamepad might have a persistent identifier? (#73)

While Gamepad#id is not ideal, especially with the same controller getting a different id reported on different browsers, there is a use case we must support.  When a game needs to display a help screen which shows which button/axis performs which game action, the game UI replies on know what type of controller is being used.  Here's an example:

https://www.reddit.com/r/SteamController/comments/693sb6/prey_2017_has_native_steam_controller_api_support/

I agree that feature detection should be used but we cannot simply drop this field.  I don't know if we can always rely on vendor/product ids being available with some of the underlying native APIs.

Any proposals for how we can at least make the id field consistent across browser implementations?

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