The default orientation is indeed system-specific. For example, on most Android phones, the default orientation is landscape + portrait-primary (IIRC) but it can be changed to be portrait-primary only. We could expose this information in the API but at the time we didn't want to. FWIW, Chrome's media controls use this information (if portrait-primary only) so it may make sense to expose this to the Web so websites can also implement logic that are based on the default orientation.
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