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In HTML, the following link types indicate the relationship between two documents, in which one links to the other using an <a>, <area>, or <link> element.

List of the defined link types and their significance in HTML
Link Type Description Allowed in these elements Not allowed in these elements
alternate
  • If the element is <link> and the rel attribute also contains the stylesheet type, the link defines an alternative style sheet; in that case the title attribute must be present and not be the empty string.
  • If the type is set to application/rss+xml or application/atom+xml, the link defines a syndication feed. The first one defined on the page is the default.
  • Otherwise, the link defines an alternative page, of one of these types:
    • for another medium, like a handheld device (if the media attribute is set)
    • in another language (if the hreflang attribute is set),
    • in another format, such as a PDF (if the type attribute is set)
    • a combination of these
<a>, <area>, <link> None.
archives Defines a hyperlink to a document that contains an archive link to this one. For example, a blog entry could link to a monthly index page this way.

Note: Although recognized, the singular archive is incorrect and must be avoided.
<a>, <area>, <link> None.
author Defines a hyperlink to a page describing the author or providing a way to contact the author.

Note: This may be a mailto: hyperlink, but this is not recommended on public pages as robot harvesters will quickly lead to a lot of spam sent to the address. In that case, it is better to lead to a page containing a contact form.

Although recognized, the rev attribute on <a>, <area> or<link> elements with a link type of made is incorrect and should be replaced by the rel attribute with this link type.
<a>, <area>, <link> None.
bookmark Indicates that the hyperlink is a permalink for the nearest ancestor <article> element. If none, it is a permalink for the section that the element is most closely associated to.

This allows for bookmarking a single article in a page containing multiple articles, such as on a monthly summary blog page, or a blog aggregator.
<a>, <area> <link>
dns-prefetch Hints to the browser that a resources is needed allowing the browser to do a DNS lookup and protocol handshaking before a user clicks the link. <link> <a>, <area>
external Indicates that the hyperlink leads to a resource outside the site of the current page; that is, following the link will make the user leave the site. <a>, <area> <link>
first Indicates that the hyperlink leads to the first resource of the sequence the current page is in.

Note: Other link types related to linking resources in the same sequence are last, prev, next.

Although recognized, the synomyns begin and start are incorrect and must be avoided.
<a>, <area>, <link> None.
help
  • If the element is <a> or <area>, it indicates that the hyperlink leads to a resource giving further help about the parent of the element, and its descendants.
  • If the element is <link> it indicates that the hyperlink leads to a resource giving further help about the page as a whole.
<a>, <area>, <link> None.
icon Defines a resource for representing the page in the user interface, usually an icon (auditory or visual).

The media, type and sizes attributes allow the browser to select the most appropriate icon for its context. If several resources match, the browser will select the last one declared, in tree order. As these attributes are merely hints, and the resources may be inappropriate upon further inspection, the browser will then select another one, if appropriate.

Note: Apple's iOS does not use this link type, nor the sizes attribute, like others mobile browsers do, to select a webpage icon for Web Clip or a start-up placeholder. Instead it uses the non-standard apple-touch-icon and apple-touch-startup-image respectively.

The shortcut link type is often seen before icon, but this link type is non-conforming, ignored and web authors must not use it anymore.
<link> <a>, <area>
index Indicates that the page is part of a hierarchical structure and that the hyperlink leads to the top level resource of that structure.

If one or several up link types are also present, the number of these up indicates the depth of the current page in the hierarchy.
<a>, <area>, <link> None.
last Indicates that the hyperlink leads to the last resource of the sequence the current page is in.

Note: Other link types related to linking resources in the same sequence are first, prev, next.

Although recognized, the synomyn end is incorrect and must be avoided.
<a>, <area>, <link> None.
license Indicates that the hyperlink leads to a document describing the licensing information. If not inside the <head> element, the standard doesn't distinguish between a hyperlink applying to a specific part of the document or to the document as a whole. Only the data on the page can indicate this.

Note: Although recognized, the synonym copyright is incorrect and must be avoided.
<a>, <area>, <link> None.
next Indicates that the hyperlink leads to the next resource of the sequence the current page is in.

Note: Other link types related to linking resources in the same sequence are first, prev, last.
<a>, <area>, <link> None.
nofollow Indicates that the linked document is not endorsed by the author of this one, for example if it has no control over it, if it is a bad example or if there is commercial relationship between the two (sold link). This link type may be used by some search engines that use popularity ranking techniques. <a>, <area> <link>
noreferrer

Prevents the browser, when navigating to another page, to send this page name, or any other value, as referrer via the Referer: HTTP header.
(In Firefox, before Firefox 37, this worked only in links found in pages. Links clicked in the UI, like "Open in a new tab" via the contextual menu, doesn't abide for this value)

<a>, <area> <link>
pingback Defines an external resource URI to call if one make a comment or a citation about the webpage. The protocol used to make such a call is defined in the Pingback 1.0 specification.

Note: if the X-Pingback: HTTP header is also present, this header has precedence over the <link> element with this link type
<link> <a>, <area>
preconnect Hints the browser to open in advance the connection to the linked web site, without disclosing any private information. <link> <a>, <area>
prefetch Hints the browser to fetch in advance the linked resource, as it will likely be requested by the user. From Firefox 44, the value of crossorigin attribute is taken into consideration, allowing to make anonymous prefetches.

Note: the Link Prefetch FAQ has details on which links can be prefetched and on alternative methods.
<a> Unimplemented,
<area> Unimplemented,
<link>
None.
preload Tells the browser to download a resource because this resource will be needed later during the current navigation. <link> <a>, <area>
prerender   <link> <a>, <area>
prev Indicates that the hyperlink leads to the preceding resource of the sequence the current page is in.

Note: other link types related to linking resources in the same sequence are first, last, next.

Although recognized, the synomyn previous is incorrect and must be avoided.
<a>, <area>, <link> None.
search Indicates that the hyperlink reference a document whose interface is specially designing for searching in this document, or site, and its resources.

If the type attribute is set to application/opensearchdescription+xml the resource is an OpenSearch plugin that can be easily added to the interface of some browsers like Firefox or Internet Explorer.
<a>, <area>, <link> None.
stylesheet Defines an external resource to be used as a stylesheet. If the type is not set, the browser should assume it is a text/css stylesheet until further inspection.

If used in combination with the alternate keyword, it defines an alternative style sheet; in that case the title attribute must be present and not be the empty string.
<link> <a>, <area>
sidebar Indicates that the hyperlink leads to a resource that would be better suited for a secondary browsing context, like a sidebar. Browsers, that don't have such a context will ignore this keyword. <a>, <area>, <link> None.
tag Indicates that the hyperlink refers to a document describing a tag that applies to this document.

Note: this link type should not be set on links to a member of a tag cloud as these do not apply to a single document but to a set of pages.
<a>, <area> <link>
up Indicates that the page is part of a hierarchical structure and that the hyperlink leads to the higher level resource of that structure.

The number of up link types indicates the depth difference between the current page and the linked resource.
<a>, <area>, <link> None.

Specifications

Specification Status Comment
Preload
The definition of 'preload' in that specification.
Working Draft Added preload.
Resource Hints
The definition of 'preconnect' in that specification.
Working Draft Added dns-prefetch, preconnect, and prerender values.
WHATWG HTML Living Standard
The definition of '<link>' in that specification.
Living Standard No change since last snapshot (WHATWG HTML Living Standard)
HTML5
The definition of '<link>' in that specification.
Recommendation Added tag, stylesheet, search, prev, prefetch, noreferrer, nofollow, next, license, icon, help, bookmark, author, and alternate.
HTML 4.01 Specification
The definition of '<link>' in that specification.
Recommendation  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 1.0 1.0 (1.7 or earlier) (Yes) (Yes) (Yes)
Alternative stylesheets ? 3.0 (1.9) ? (Yes) ?
prefetch ? ? ? ? ?
prerender ? ? ? ? ?
preconnect 46 39 (39) [1] Not supported ? Not supported
dns-prefetch 46 3.0 (1.9) ? ? ?
preload Not supported ? ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support (Yes) (Yes) 1.0 (1.0) (Yes) (Yes) (Yes) (Yes)
Alternative stylesheets ? ? 4.0 (2.0) ? ? ? ?
prefetch Not supported ? ? ? ? ? ?
prerender ? ? ? ? ? ? ?
preconnect 46 ? 39.0 (39) [2] ? ? ? 42.0 [1]
dns-prefetch 46 ? 1.0 (1.9) ? ? ? (Yes)
preload Not supported Not supported ? ? ? ? Not supported

[1] Before Firefox 41, it didn't obey the crossorigin attribute.

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 Last updated by: teoli,