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HTML is a markup language that web browsers use to interpret and compose text, images, and other material into visible or audible web pages. Default characteristics for every item of HTML markup are defined in the browser, and these characteristics can be altered or enhanced by the web page designer's additional use of CSS .
Semantic HTML is the use of HTML markup to reinforce the semantics, or meaning, of the information in web pages and web applications rather than merely to define its presentation or look. Semantic HTML is processed by traditional web browsers as well as by many other user agents .
One of the main goals of style sheet languages is to separate the syntax that defines document content from the syntax endowed with presentation semantics. This is the norm on the World Wide Web, where the Cascading Style Sheets language provides a large collection of presentation semantics for HTML documents. References
While the idea of markup language originated with text documents, there is increasing use of markup languages in the presentation of other types of information, including playlists, vector graphics, web services, content syndication, and user interfaces. Most of these are XML applications because XML is a well-defined and extensible language.
Extensible HyperText Markup Language (XHTML) 2000 (January 26) W3C: Text/XML editor, HTML editor: Web browser: Halibut: 1999 Simon Tatham: Text editor: Output to ASCII text, HTML, PDF, PostScript, Unix man pages, GNU Info, Windows Help (.CHM files), Windows WinHelp (old .HLP files) HyperText Markup Language (HTML) 1993 Tim Berners-Lee: Text ...
A web style sheet is a form of separation of content and presentation for web design in which the markup (i.e., HTML or XHTML) of a webpage contains the page's semantic content and structure, but does not define its visual layout (style). Instead, the style is defined in an external style sheet file using a style sheet language such as CSS or ...
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An HTML document is composed of a tree of simple HTML nodes, such as text nodes, and HTML elements, which add semantics and formatting to parts of a document (e.g., make text bold, organize it into paragraphs, lists and tables, or embed hyperlinks and images). Each element can have HTML attributes specified. Elements can also have content ...