Reference Links

Reference links are defined in Markdown by placing the link text in square brackets followed by a link label in a second set of square brackets. At the end of the document, the link label is placed in square brackets, followed by a colon, followed by the destination URL. For example:

[CommonMark website][commonmark]

[commonmark]: http://www.commonmark.org

As with inline links, reference links can contain an optional title which is placed in double quotes following the link destination URL:

[CommonMark website][commonmark]

[commonmark]: http://www.commonmark.org "CommonMark"

If the destination URL is on the same server, you may use relative URLs like this:

[Spec page](spec)

[spec]: /spec