This document discusses the keyword "this" in JavaScript and how its value is determined. It provides examples of how "this" refers to the global window object, a calling object, or can be undefined. It also demonstrates how "this" refers to a DOM element when used in an event handler. The document concludes that "this" generally refers to the global context, but can refer to a new object when used with "new" or a member object when called as a method, unless asynchronous.