Quote:
Originally Posted by crmalcolm
'Drivers will be judged to have left the track if no part of the car remains in contact with it and, for the avoidance of doubt, any white lines defining the track edges are considered to be part of the track but the kerbs are not.'
So as mentioned the track (racing surface is a concept) is defined by the white lines. The regulations require a part of the car (not 2 wheels) to remain in contact or the driver will be judged to have left the track. The surfaces outside of the white lines are not 'racing surface'.
In this image, Verstappen has left the track  :
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This image also demonstrates the first time Verstappen was alongside enough to make the move legitimate.