What does Swiff class do?

What is the result of- alert($defined('«body»'));?

By default, the class Tips use the element's ___ to display tooltip.

Consider the following code snippet:
    fx = new Fx.Tween($('id1'), {
        onComplete: function() {
            alert('Finish');
        }
    });
    fx.set('opacity', 0.5);
Does the onComplete event of fx fire after the opacity of id1 element is changed to 0.5 by the above-mentioned code?

What does the code snippet do? e1.cloneEvents(e2);

Consider the following code snippet: var global = 1; var a = new Chain(); a.chain( function(){ global++;}, function(){ global++;} ); a.callChain(); a.callChain(); What is the result of this code snippet?

Assume that c1 element is the child of p1 element, how many times is the mouseenter event fired if the mouse moves from outside to p1 element, then over the c1 element?

JSON.encode function converts any ___ into a JSON string.

Which statements change the background color of id1 element to yellow?

Which classes can you use to create sortable elements?

Consider the following: $('id1').load('data'): What does the code snippet do?