Re: [w3c/gamepad] are timestamps a potential tracking/fingerprinting vector? (#74)

Chatted offline with @samuelweiler and we decided that the language in the spec was a convoluted way of saying that `timestamp` starts at `0` when the navigation is started. We agreed that this is not likely a vector for fingerprinting as each frame has a different zero-point.

The question of events delivered to multiple browsing contexts is a separate issue. Given that this is a polling as well as event-driven interface we should consider both whether connect/disconnect events (as well as future button/axis events) are fired for a visible, but not foreground, frame and whether a page polling `navigator.gamepads` in the background observes changes.

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