Can I set start_pitch for VR View for the web?

The documentation for Google VR View on the Internet has a start_yaw control parameter that allows you to rotate the image’s initial orientation horizontally:

start_yaw: {Number} The initial yaw of the viewer, in degrees. (optional, default is 0)

Is it also possible to set the initial step (vertical rotation)?

Adding "start_pitch = 90" has no effect.

https://developers.google.com/vr/concepts/vrview-web

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Source: https://habr.com/ru/post/1658188/