HTML | <a> rel Attribute
The “rel” attribute specifies the relationship between the current document and the linked document/content.
Only used if the “href” attribute is present.
Syntax: <a rel="value">
Search engines may also use the information in the “rel” attribute to determine how to index or display the page.
|alternate||Provides a link to an alternate representation of the page (i.e. print page, translated or mirror)|
|author||Provides a link to the author of the document|
|bookmark||Permanent URL used for bookmarking|
|external||Indicates that the referenced document is not part of the same site as the current document|
|help||Provides a link to a help document|
|license||Provides a link to licensing information for the document. (copyright information)|
|next||Provides a link to the next document in the series|
|nofollow||Links to an unendorsed document, like a paid link.
(“nofollow” is used by Google, to specify that the Google search spider should not follow that link)
|noreferrer||Requires that the browser should not send an HTTP referer header if the user follows the hyperlink|
|noopener||Requires that any browsing context created by following the hyperlink must not have an opener browsing context|
|prev||The previous document in a selection|
|search||Links to a search tool for the document|
|tag||A tag (keyword) for the current document|
HTML | <link> rel Attribute
|dns-prefetch||instruct browser to download and cache a resource (link script / stylesheet / font )|
|modulepreload||instruct browser to download, cache and comile a JS module script asap.|
|preconnect||browser set up a connection when it retrieves something from a new third-party domain, when a site uses a font from Google Fonts, loads React from a CDN, or requests a JSON response from an API server, help speed up the initial connection.|
|prefetch||specifies that the target resource should be preemptively cached. (use
|preload||specifies that the target resource should be preemptively cached. (use
|prerender||browser to load a URL and render it in an invisible tab, on clicks on a link, page render immediately.|