Why is event delegation important in Prototype?

When writing custom DOM methods, what must be placed as the first argument?

Using Element.Layout you can measure elements that are hidden:

Which method that is not available to convert to JSON in Prototype

How would you create an AJAX call to get the url '/echomyid'?

What object would you use in Prototype, and what are the benefits of using said object?

In the context of Prototype, “safe” means that AJAX will function how?

What solution has Prototype 1.7 introduced to provide a more concise API?

How would you wait for the DOM to be loaded so that you can start manipulating the page with Javascript?

What code will return an instance of Element.Layout?

Which of the following is not an example of an AJAX callback?