New styling for dropdowns, including animated drop and blue highlight. [item][/item] tags are no longer required, and are now rendered as <div></div> (block level) elements for the sake of backwards compatibility.
well of course you can!
example in the original post was just to display the improved look of the code function when there's only one line, i suppose.
tip: if you want to experiment with bbcode, send private messages to yourself or use the "go advanced" and "preview message" buttons at the bottom of your reply box