When you look at a web page in a web browser, you see, at the simplest level, words. These words usually have some style characteristics, such as different font sizes and colors. In many cases a page also displays images or maybe video. Sometimes there is a form where you can enter (or search) for information, or customize the display of the page to your liking. Often a page contains animated content and content that changes while the rest of the page remains the same. ..