I was actually inspired by the cover flow effect found among the various folder options of Mac OS X to create this demo. Let's see the details.
CSS: create social network icons
CSS3 allows us to control almost every aspect of the visual layout of an element: properties such as border-radius, text-shadow, opacity combined with gradients and web fonts gives us a first-class control over elements. We can combine all these features to create the icons of social network. Look ma, no images!
jQuery: why an empty text field cannot be null
There's a widespread tendency to consider the value property of a text field as an attribute instead of a simple property whose value is a string. Such property cannot have a primitive null value because the DOM specifications allow only nodes to have such a value. jQuery wraps the value property with its method val() and it uses the same principles. Let's see why an empty value of a text field cannot be null.