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

Lets say you have an array with name myArray. How would you organize a loop?

Element#measure(property) gives:

By using the Element#on object in Prototype event API, what benefit is being gained?

When using data from an untrusted source, it should be sanitized. What does this entail?

If your data is not an instance of an object and you invoke the toJSON method, where should the syntax: toJSON() be located in the string?

Why is event delegation important in Prototype?

Prototype JS framework with version 1.6.0 defines two additional class properties:

Utilities $A and $R create an array and ObjectRange object. What will be their results given the following string; $A($R('a', 'e')) ?

How would you create a new div element and insert it as the last child of the body?

Why would it be beneficial to use an array in Prototype?