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
script	not allowed	not allowed	Was proposed to replace <script>. Use <script> instead.	none		Rejected
glossary	hyperlink	hyperlink	Target document provides definitions for words in current document.	HTML4		Proposal
chapter	hyperlink	hyperlink	Target document is a subdocument of the current document.	HTML4	section, subsection, appendix	Proposal
edit	hyperlink	hyperlink	Target document is an editable version of the current document.	Atom Protocol		Proposal
openid.server	external resource	not allowed	OpenID authentication delegation	OpenID specificaion		Proposal
openid.delegate	external resource	not allowed	OpenID authentication delegation	OpenID specificaion		Proposal
widget	hyperlink	hyperlink	Points to a widget.	Widgets 1.0 Editor's draft		Proposal
service	external resource	not allowed	Points to a resource describing a service API	ServiceRelExtension		Proposal
acquaintance	hyperlink	hyperlink	the person represented by the current document considers the person represented by the referenced document to be an acquaintance	XFN		Proposal
child	hyperlink	hyperlink	the referenced person is a child 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
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
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
friend	hyperlink	hyperlink	the person represented by the current document considers the person represented by the referenced document to be a friend	XFN		Proposal
kin	hyperlink	hyperlink	the referenced person is part of the extended family of the person represented by the current document	XFN		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
parent	hyperlink	hyperlink	the referenced person is a parent of the person represented by the current document	XFN		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

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 have been through the Microformats process, and been approved by the Microformats community.

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