The ScreenOrientation API (https://developer.mozilla.org/en-US/docs/Web/API/Screen_Orientation_API) does not appear to be implemented, can the WebKit team implement this to enabling locking the screen orientation (e.g. to landscape)? Chrome appears to have already implemented this: https://www.chromestatus.com/feature/6191285283061760.
*** This bug has been marked as a duplicate of bug 102869 ***