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URL encoding, officially known as percent-encoding, is a method to encode arbitrary data in a uniform resource identifier (URI) using only the US-ASCII characters legal within a URI.
External links use URLs to link directly to any web page. External links are enclosed in single square brackets (rather than double brackets as with internal links), with the optional link text separated from the URL by a space (not a "|" as with internal links). When rendered, external links are followed by an external link icon. For example,
A link relation is a descriptive attribute attached to a hyperlink in order to define the type of the link, or the relationship between the source and destination resources. The attribute can be used by automated systems, or can be presented to a user in a different way. In HTML these are designated with the rel attribute on link, a, or area ...
If constructing URLs for Wikipedia pages, remember to convert spaces into underscores, and to percent-code special characters where necessary, as described in the previous section. (For how to do this in template code, see Templates and programming below.)
An inline link displays remote content without the need for embedding the content. The remote content may be accessed with or without the user following the link. An inline link may display a modified version of the content; for instance, instead of an image, a thumbnail, low resolution preview, cropped section, or magnified section may be shown.
To link to a Wikipedia article in a particular language inline (as opposed to the links in the sidebar), use [[:language code:Title]]. To link to a page on a different project in a particular language, expand the above syntax with a code for the project from the table below in § Prefix codes for linking to projects, as in [[:project:language ...
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For codes from 0 to 127, the original 7-bit ASCII standard set, most of these characters can be used without a character reference. Codes from 160 to 255 can all be created using character entity names. Only a few higher-numbered codes can be created using entity names, but all can be created by decimal number character reference.