rel
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rel
rel is short for "relationship" and an HTML 4.01 attribute on the a and link elements. The 'rel' attribute is used for several popular elemental microformats such as rel-nofollow, rel-license, rel-tag, and XFN. Popularity is noted as of 2005-12 per the Google study on markup use, in particular the use of link relationships, the <a> tag, and related page headers (which noted that "XFN [is] the most popular HTML metadata profile").
For more on the rel attribute and its use in microformats, see:
rel microformats
Specifications and drafts:
- XFN: rel-acquaintance, rel-contact, rel-friend, rel-me and other xfn values.
- rel-directory
- rel-enclosure
- rel-home
- rel-license
- rel-nofollow
- rel-payment
- rel-tag
See existing-rel-values for a more comprehensive list of rel values from HTML4, microformats, and other sources.
articles
Articles and other tutorials written about the "rel" attribute and microformats use of: