Re: [w3ctag/design-reviews] WebXR Layers (#528)

@cabanier couple of more questions as we read the spec. 

It seems that exposing `nativeProjectionScaleFactor` will enable authors using the feature to obtain the scale factor for a given context (assuming post transform?). If this is the case, my assumption is that such capability will be very sought after many other places in the platform (users of CSSOM have been asking for something like this forever). Could this be either omitted or made available outside the WebXR context?

Have you thought through some of the threat vectors that could abuse such capability? How quickly and easily could a malicious actor create a WebXR context in a different content and obtain the composition layers?

One final meta question. Have you considered, or at least do you think it is feasible to break down this review into few logical pieces that build on top of each other? Layer Types, Spaces, Creation, Rendering etc. That model of reviews will be much more expedient to all of us.

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