Checkboxes are being checked before click handler is even called

Question

I have the following snippets: http://jsfiddle.net/L7rne/5/ and http://jsfiddle.net/L7rne/6/

It turns out that if you pause execution of the script in the click even

Answer 1

By time the event handler fires, the event has already taken place, and the browser is re-rendering in response. If the handler gets suspended, then the browser completes the work because nothing prevented it.

Its like calling the police to a bank robbery, and they are in a traffic accident on the way. The robbers get away. The deed is done.