All finite things reveal infinitude.
|--Theodore Roethke (1908–1963), U.S. poet|
What you see on your browser isn't necessarily what you get. Whenever you view a Web page through a browser, you see only the browser's interpretation and rendering of the content delivered to it. What stays hidden from view is a vast amount of information. To uncover these hidden treasures is to move beyond browsing and enter into a genuine understanding of the nearly infinite variations of Web technologies.
From a typical Web page on the Internet, you can find information such as comments embedded in the HTML code, source code of client-side scripts, keywords for referencing pages, hidden parameters passed in forms, ...