A Brief Introduction of HTML
Hypertext Markup Language (HTML) is the text markup language currently used on the World Wide Web. If you have ever written a school a report or business memo, you have encountered text markup. Your document probably came back to you covered in red ink, courtesy of your teacher or boss. The symbols and acronyms used in those editorial markup suggested changes for you to interpret or implement.
In that scenario,markup is separate from the actual content of your document. When you create, a document with a word processing program such as Microsoft Word or WordPerfect, the program uses markup language to indicate the structure of formatting of that electronic document. What you see on your screen looks like a page of formatted text; the rest is done “behind the scene.” HTML is the not so behind the scenes markup languages that is used to tell Web browser how to structure and display Web pages.
HTML has a very well-defined syntax; all HTML document should follow a formal structure. The World Wide Web Consortium(W3C) is the primary organization that attempts to standardize HTML (as well as many other technologies used on the web). To provide a standard, the W3C must carefully specify all aspects of the technology. In the case of HTML, this means precisely defining the elements in the language.
The W3C has defined HTML as an application of the Standard Generalized Markup Language (SGML). In short,SGML is a language used to define other languages by specifying the allowed document structure in the form of document type definition (DTD), which indicates the syntax that can be used the various element of a language such as HTML

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