Re: [w3ctag/design-reviews] Device Posture API [formerly Screen Fold API] (#575)

Thanks for the feedback.

We did provide an example in the spec and we have various demos online.

Say you want to implement something like this?

![Image of a split ux](https://d3unf4s5rp9dfh.cloudfront.net/SDP_blog/2021-01-06-01-flex_mode_05.png)

How can you detect when to do the split mode? The device doesn't change its orientation, only the hinge moves.

The API will tell you that you're now folded and that you can enable the Split UX. 

The same would apply if the device fold over and you would want to turn off the screen on the non-user-visible side or for example if you wanted to do a two-player mode. This is what people call "tent mode".

Now in the future you may have multiple folds and yes we need a way to know where they are and that's what the Window Segment API is about. We have a better detailed explainer over here: https://webscreens.github.io/form-factors/

At this point native is successfully leveraging the posture definition as we laid them out here. Android has been shipping a simple posture API which is being used by several native apps like Google Duo, YouTube, Samsung native apps and so forth.


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