Definition: (1) In Hyper Text Markup Language, code which denotes the type, formatting, position, etc. of an element such as graphic, text, etc. * Used by browser software to determine how to display the element. (2) Part of computer file containing ancillary information which is kept separate from the main data e.g. in the header. * May provide data indicating e.g. the byte order of the data, version and creation data, compression used, output size, etc.

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