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The World Wide Web runs HTML, scripting languages, and object files (such as audio, video, graphics). Most of the coding is located on the web server and downloaded as needed. Scripting languages can run either on the web server (like CGI or ASP) or within the confines of the browser (like JavaScript). This section will focus on web languages that download and operate within the browser (client-side).
Web site documents are made up of ordinary text files conforming to the Hypertext Markup Language (HTML) standard. HTML is a subset of the larger Standardized General Markup Language (SGML) document specification in use long before HTML. A simple HTML file contains four components: