At least at first glance, the definition of the "Stage" pattern seems hard to grasp, which implies that the pattern in question has to be addressed from a practical point of view. In doing so, you'll have a much better idea of how it works, and eventually how it can be applied in concrete cases. [...] Over the course of this two-part series, I'm going to introduce its key concepts, and logically show you how to implement it with copious code samples.

They start by defining a DIV class to act as a foundation for the Stage functionality (with methods to set the ID, the CSS class and the data inside it). They also develop a DivContext class to handle special methods surrounding the inputted DIV. Bringing it all together, they create a default DIV object and pass it into the custom DivContext to get and set the contents of the DIV.