Link types

Link type	Effect on...		Brief description
Link type	`link`	`a` and `area`	Brief description
`alternate`	Hyperlink	Hyperlink	Gives alternate representations of the current document. See note for `alternate stylesheet.`
`archives`	Hyperlink	Hyperlink	Provides a link to a collection of records, documents, or other materials of historical interest.
`author`	Hyperlink	Hyperlink	Gives a link to the current document's author. This could be a `mailto:` link to an email address.
`bookmark`	not allowed	Hyperlink	Gives the permalink for the nearest ancestor article or section.
`contact`	Hyperlink	Hyperlink	Gives a link to contact information for the current document.
`external`	not allowed	Hyperlink	Indicates that the referenced document is not part of the same site as the current document.
`feed`	Hyperlink	Hyperlink	Gives the address of a syndication feed. Can be combined with `alternate` if the feed is specifically for the current document. The first `feed` in a document is used as the default feed.
`first`	Hyperlink	Hyperlink	Indicates that the current document is a part of a series, and that the first document in the series is the referenced document.
`help`	Hyperlink	Hyperlink	Provides a link to context-sensitive help.
`icon`	External Resource	not allowed	Imports an icon to represent the current document.
`index`	Hyperlink	Hyperlink	Gives a link to the document that provides a table of contents or index listing the current document.
`last`	Hyperlink	Hyperlink	Indicates that the current document is a part of a series, and that the last document in the series is the referenced document.
`license`	Hyperlink	Hyperlink	Indicates that the current document is covered by the copyright license described by the referenced document.
`next`	Hyperlink	Hyperlink	Indicates that the current document is a part of a series, and that the next document in the series is the referenced document.
`nofollow`	not allowed	Hyperlink	Indicates that the current document's original author or publisher does not endorse the referenced document.
`pingback`	External Resource	not allowed	Gives the address of the pingback server that handles pingbacks to the current document.
`prefetch`	External Resource	not allowed	Specifies that the target resource should be pre-emptively cached.
`prev`	Hyperlink	Hyperlink	Indicates that the current document is a part of a series, and that the previous document in the series is the referenced document.
`search`	Hyperlink	Hyperlink	Gives a link to a resource that can be used to search through the current document and its related pages. This can be used for OpenSearch description documents.
`stylesheet`	External Resource	not allowed	Imports a stylesheet. See note for `alternate stylesheet.`
`sidebar`	Hyperlink	Hyperlink	Specifies that the referenced document, if retrieved, is intended to be shown in the browser's sidebar (if it has one).
`tag`	Hyperlink	Hyperlink	Gives a tag (identified by the given address) that applies to the current document.
`up`	Hyperlink	Hyperlink	Provides a link to a document giving the context for the current document.

If alternate and stylesheet are both given on one link, the usual meaning of alternate does not apply: the link is importing an alternative style sheet. User can choose between all the linked style sheets, but the first non-alternative style sheet will be chosen by default.