Update explainer.md with changes related to use of -1

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Home for explainer documents originated by the Microsoft Edge team

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Update explainer.md with changes related to use of -1 #641

Closed sahirv closed 1 year ago

sahirv commented 1 year ago

Implementation of PointerEvent.deviceId into Chromium has resulted in minor changes to the behavior of the API. This pull request reflects those changes. Namely, the use of null and undefined values for deviceId has ceased. Additionally, A value of 1 is reserved for mouse events.