RelExtensions

This page lists the allowed extension values for the rel="" attribute in HTML5. You may add your own values to this list, which makes them legal HTML5 rel values. We ask that you try to avoid redundancy; if someone has already defined a value that does roughly what you want, please reuse it.

Keyword	Effect on...		Brief description	Link to more details	Synonyms	Status
	link	a and area
acquaintance	hyperlink	hyperlink	the person represented by the current document considers the person represented by the referenced document to be an acquaintance	XFN		Proposal
author	hyperlink	hyperlink	The linked document is the page/email an agent (people or firm or...) responsible for the content.			Proposal
canonical	hyperlink	not allowed	Robots (e.g., search engines) should treat the document containing the tag as a minor variation of the linked document, which may result in the removal of the former from a web index and in the consolidation of its quality signals in the latter.	[1]		Proposal
chapter	hyperlink	hyperlink	Target document is a subdocument of the current document.	HTML4	section, subsection, appendix	Proposal
child	hyperlink	hyperlink	the referenced person is a child of the person represented by the current document	XFN		Proposal
co-resident	hyperlink	hyperlink	the referenced person lives in the same residence as the person represented by the current document	XFN		Proposal
co-worker	hyperlink	hyperlink	the referenced person is a co-worker of the person represented by the current document	XFN		Proposal
colleague	hyperlink	hyperlink	the referenced person is a colleague of the person represented by the current document	XFN		Proposal
contact	hyperlink	hyperlink	the person represented by the current document considers the person represented by the referenced document to be a contact	XFN		Proposal
contributor	hyperlink	hyperlink	The linked document is the page/email an agent (people or firm or...) involved in the production of the content, but not his main author(s).			Proposal
crush	hyperlink	hyperlink	this person considers the referenced person to be a crush (i.e. has a crush on the referenced person)	XFN		Proposal
date	hyperlink	hyperlink	this person considers the referenced person to be a date (i.e. is dating the referenced person)	XFN		Proposal
edit	hyperlink	hyperlink	Target document is an editable version of the current document.	Atom Protocol		Proposal
edituri	hyperlink	not allowed	a link to an RSD file describing how to edit the given page.	rsd		Proposal
friend	hyperlink	hyperlink	the person represented by the current document considers the person represented by the referenced document to be a friend	XFN		Proposal
glossary	hyperlink	hyperlink	Target document provides definitions for words in current document.	HTML4		Proposal
kin	hyperlink	hyperlink	the referenced person is part of the extended family of the person represented by the current document	XFN		Proposal
license	hyperlink	hyperlink	The linked document is a license for the current document	rel-license		Proposal
me	hyperlink	hyperlink	the referenced document represents the same person as does the current document	XFN		Proposal
met	hyperlink	hyperlink	this person has met the referenced person	XFN		Proposal
muse	hyperlink	hyperlink	the referenced person inspires the person represented by the current document	XFN		Proposal
neighbor	hyperlink	hyperlink	the referenced person lives nearby the person represented by the current document	XFN		Proposal
openid.delegate	external resource	not allowed	OpenID 1.1 authentication delegation	OpenID specification		Proposal
openid.server	external resource	not allowed	OpenID 1.1 authentication delegation	OpenID specification		Proposal
openid2.local_id	external resource	not allowed	OpenID 2.0 authentication delegation	OpenID Auth 2.0 section 7.3.3		Proposal
openid2.provider	external resource	not allowed	OpenID 2.0 authentication endpoint	OpenID Auth 2.0 section 7.3.3		Proposal
parent	hyperlink	hyperlink	the referenced person is a parent of the person represented by the current document	XFN		Proposal
pgpkey	hyperlink	not allowed	The linked document is the PGP public key file (which may contain multiple keys) of the author(s) of the page.	[2], [3]		Proposal
profile	hyperlink	not allowed	this referenced link is a metadata profile for the current document	HTML Meta data profiles		Proposal
related	hyperlink	hyperlink	this referenced link identifies a resource related to the current document	Atom Syndication Format		Proposal
reviewer	hyperlink	not allowed	The linked document is the page/email an agent (people or firm or...) responsible for reviewing the content.	Of interest: used by the CSS WG for the CSS 2.1 Test Suite.
script	not allowed	not allowed	Was proposed to replace <script>. Use <script> instead.	none		Rejected
service	external resource	not allowed	Points to a resource describing a service API	ServiceRelExtension		Proposal
shortlink	hyperlink	hyperlink	Identifies a shorter form of the URL for the current document, provided by the document owner.	shortlink Specification		Proposal
sibling	hyperlink	hyperlink	the referenced person is a sibling of the person represented by the current document	XFN		Proposal
spouse	hyperlink	hyperlink	the referenced person is a spouse of the person represented by the current document	XFN		Proposal
sweetheart	hyperlink	hyperlink	this person considers the referenced person to be their sweetheart	XFN		Proposal
tag	hyperlink	hyperlink	The linked document is an author-designated "tag" (or keyword/subject) for the current page.	rel-tag		Proposal
technicalauthor	hyperlink	hyperlink	The linked document is the page/email an agent (people or firm or...) responsible for the technical construction of the page (i.e. the HTML/CSS/PHP code), not for the content.			Proposal
timesheet	external resource	not allowed	SMIL Timesheet	SMIL Timesheets 1.0		Proposal
translator	hyperlink	hyperlink	The linked document is the page/email an agent (people or firm or...) responsible for the translation of the page.			Proposal
webmaster	hyperlink	hyperlink	The linked document is the page/email an agent (people or firm or...) aviable for requests about the content of the page.		maintainer	Proposal
widget	hyperlink	hyperlink	Points to a widget.	Widgets 1.0 Editor's draft		Proposal
wlwmanifest	hyperlink	not allowed	A link to a manifest for Windows Live Writer.	msdn		Proposal

The "Effect on... link" column must either say "not allowed" if the rel value is not allowed on <link> elements, "hyperlink" if the rel value creates a hyperlink, or "external resource" if the rel value creates a link to an external resource.

The "Effect on... a and area" column must either say "not allowed" or "hyperlink".

For the "Status" section to be changed to "Accepted", the proposed keyword must either have been through the Microformats process, and been approved by the Microformats community; or must be defined by a W3C specification in the Candidate Recommendation or Recommendation state. If it fails to go through this process, it is "Rejected".

For more details, see the HTML5 specification. See also the Microformats wiki page on this matter.