The newly published @w3c #CandidateRecommendation "Device Posture API" allows #WebApps to request and be notified of changes of the posture of a device #timetoimplement
w3.org/TR/device-posture/

Device posture refers to its physical position, detected via sensors. With foldable devices, understanding posture is key for responsive design, especially when the device isn’t fully flat.

Read the explainer: github.com/w3c/device-posture/…
Feedback welcome: github.com/w3c/device-posture/