The rel attribute inside anchor tags (<a>) describes the relation to the document where the link points to. It’s optional, but a few values can come in very handy. It can take one of these 14 values:
- alternate: Points to an alternate version of the document.
- author: Points to the author of the document.
- bookmark: Points to an URL for bookmarking.
- enclosure: Points to a downloadable asset.
- external: Points to an URL on a different domain.
- help: Points to an help document.
- license: Points to legal, license or copyright information.
- next: Points to the next document in a series.
- nofollow: Indicates to search engines that the document in not endorsed. This is the most commonly used value and should be used for paid links and ads.
- noreferrer: Indicates to the browser not to send an HTTP referrer header.
- noopener: Prevent an opener browsing context. It should be used when using target=”_blank” on a link. Mathias Bynens discussed the security benefits of this and Jake Archibald discussed the performance benefits.
- prev: Points to the previous document in a series.
- search: Points to a search function for the document.
- tag: Points to a document that’s covers a keyword/tag of the current document.
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