The spacebar is our control key. spacebar + up-arrow or down-arrow: NEXT SEGMENT spacebar + left-arrow or right-arrow: - step onto bridge, see so

The spacebar is our control key. spacebar + up-arrow or down-arrow: NEXT SEGMENT spacebar + left-arrow or right-arrow: - step onto bridge, see sourcedoc and xanadoc side by side This plus the fact that the proof-of-concept of a thing 40 years in the making doesn't work without Javascript is truly insane.