Javascript event registration models, good explanation

It's worth noting that DOM4 spec makes third argument in addEventListener() method optional.

It will default to false if you skip it (which is almost always preferable):

  element.addEventListener('mousedown', callback);

There's also an object-based argument to addEventListener: http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-E...

More discussion here: http://ajaxian.com/archives/an-alternative-way-to-addeventli...