Ah, you've stumbled on the event queuing behaviour of hyperscript: If a triggering event is received while an event handler is executing, you can specify vario

Ah, you've stumbled on the event queuing behaviour of hyperscript: If a triggering event is received while an event handler is executing, you can specify various behaviours: https://hyperscript.org/features/on/#queueing https://hyperscript.org/features/on/#queueing The default is queue last, which will queue the last event and trigger the event handler again once it completes. I agree that is wrong in this case, and so it should specify `queue none` in the handler. I will update the code. Thank you for taking a close look at the example!