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Displays a flag of the named parameter in "icon" size, currently 22x20 pixels plus a one pixel border. The image also has an alt attribute (usually "Flag of <name>"), which is displayed by most browsers by hovering over the flag image, or interpreted by screen reader software.
- name — The first parameter is mandatory, and identifies the name of the country, region, city, etc. A full list of available parameters can be found in Category:Country data templates. For example, Template:Country data Poland is used when the name parameter is specified as Poland. Many flags are also available via shortened "aliases", such as standard three letter country codes as specified by ISO 3166-1 alpha-3, IOC, or FIFA. The list of available "aliases" are found in Category:Country data redirects. Many of these country codes could be considered obscure, so it is recommended to use the full country name.
- variant — The second parameter is optional, and identifies a flag variant to be used instead of the standard flag. This is most often used for historical flags but can also be used to specify naval flags, sport-use flags, etc. The list of available flag variants for each country is documented on the specific page for the country data template. For example, Template:Country data Poland includes a description of each of the available flag variations for Poland. This parameter can be a named parameter (e.g. "variant=1815"), or a positional parameter, always after the country name.
- size — This parameter is optional, and is used to specify the maximum width and/or height of the flag image. This parameter is specified using standard image syntax.