The entire set of tags (formatting descriptors) for a document . This tells the browser how to display the data.

The procedure of inserting file markers, field tags, and/or hypertext links in the text. Mark-up can be based on a standard markup language, such as the Automated Composition System of the Government Printing Office or the Standard Generalized Markup Language (SGML). A useful markup language can also be unique to one organization or even to one file. The particular file marker and field tags used with a file are declared when in setting up a text indexer. Hypertext links do not have to be declared, because they are automatically indexed as searchable terms.

codes used to provide information about a text, such as POS tags, SGML codes etc

mahr-Kupp) Web-Related: Text characters used in a logical, very specific way defined by the type of language written. Coding. Mark-up is "read" by web browsing devices and other user agents.

computing term describing the process of embedding tags in electronic text so as to distinguish the text's logical, syntactic, or structural components; the tags so embedded.(OED)