Rel and Rev in html

I can't understand the purpose of the Rel and Rev tags in html.
Are they used by browsers/search engines? and how?
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They are not supported by any of the major browsers, they're more for search engines.


The rel attribute specifies the relationship between the current document and the linked document.

The rel attribute is not supported in any of the major browsers.

Note: Browsers do not use this attribute in any way. However, search engines can use this attribute to get more information about a link.



The rev attribute specifies the relationship between the linked document and the current document.

The rev attribute is the reverse of the rel attribute.


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