Problem Domain, Objects, and the DOM

Object Literals (pp.100-105)

Objects group together a set of variables and functions to create a model of something you would recognize from the real world. In an object, variables and functions take on a new name.

In an object:

Document Object Model (pp.183-242)

The Document Object Model (DOM) specifies how browsers should create a model of an HTML page and how JavaScript can access and update the contents of a web page while it is in the browser window.