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

this is a good idea. do we have telemetry from the respective browsers on cross-origin usage of `Gamepad#id`? (I would assume it's close to zero.) would `navigator.getGamepads()` throw a `NotAllowedError` exception if a cross-origin document calls `Gamepad#id` as `<iframe src="https://example.com/page-using-the-gamepad-api"></iframe>` vs. `<iframe src="https://example.com/page-using-the-gamepad-api" allow="gamepad"></iframe>`?

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