Re: [w3ctag/design-reviews] User Activation Delegation through postMessages (#347)

I'm having serious doubts as to whether the notion of "user activation" should even be exposed to the web platform. This isn't a top-level feature in itself but rather a UA mechanism to control the availability of other features. 

If we expose user activation this gives web page developers no indication of which features will be enabled or disabled, and I expect that set of features to be UA dependent and change over time.

What happens when UAs invent new mechanisms to gate features, such as eye tracking or the like? Is this an API we want to support forever?

I'd much rather see improvements to permissions APIs or other mechanisms to get access to, and be able to delegate access to, the individual features that would be gated by user activation.

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