setTimeout(), setInterval(), and requestAnimationFrame()

const raf1 = requestAnimationFrame(animate1);
const raf2 = requestAnimationFrame(animate2);
cancelAnimationFrame(raf1);

They execute in parallel
Only the last one executes
They queue in order and execute sequentially
Multiple requestAnimationFrame calls: 1) Queue in order for next frame, 2) Execute sequentially in registration order, 3) Can be individually cancelled, 4) Share the same frame timing, 5) All execute within the same frame, 6) Useful for coordinating multiple animations.
They execute in random order