Re: [w3ctag/design-reviews] InteractionID in Event Timing (#670)

> @npm1 For the InteractionID generation, I think we might want to clarify that if a random number generator is used, the RNG internal state shouldn't be shared across origins, to prevent sites from correlating IDs generated on different origins for the purposes of cross site tracking.

Yes, the idea will be to keep a "user interaction value" in each Window.

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