Element#on has what distinct and beneficial features in Prototype 1.7?

How can you inherit from a Storage class?

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

What code will return an instance of Element.Layout?

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

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

How can you get a copy of the array without any null or undefined values?

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

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

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

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