radius={6}

Tight corners

The hardest case: a 90° swing inside six pixels, leaving square with the next edge.

radius={999}

Pill

The tangent turns continuously, so there is no seam where the arc meets the straight run.

radius="squircle"

Continuous corners

A squircle has no constant-radius arc at all, and the beam still tracks it.

beams={2}

Two beams

Phase offsets along one path, so they stay half a lap apart at any duration.

colorFrom / colorTo

Any two colours

The tail fades in from one and the head burns out in the other.

reverse · pauseOnHover

Counter-clockwise

Hover to freeze it mid-corner and check the angle.