Bad value $ for attribute rel on element a: The string $ is not a registered keyword

Rule from html under compatibility category

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Invalid link type was found for attribute rel in a tag. HTML5 only allows you to use the standard link types without registering a new type.

<a href="sample.html" rel="non-existing-linktype">Sample Link</a>

How do I fix this ?

Use a standard link type:

Link Type Description
alternate Used for an alternative page with same content that may be in a different format.
author Used to link to the author of the content in the nearest article element or the whole page.
bookmark Used to link to the nearest article element or section between the last element used if no article element is present.
help Used to link to a help page for the current page.
license Used to link to the copyright license terms for the current page or document.
nofollow Used in a link to indicate that the link is not endorsed or of the same author of the current page.
noreferrer Used to indicate that no referrer information is to be passed on to the next request.
prefetch Used to indicate that the content linked to will benefit from being cached.
search Used to indicate that the content being linked to has an interface for searching the document or related sources.
tag Used to indicate that the content linked to is in relation to the content of the current page.
next Used to indicate that the content linked to is the next part of the current document or page.
prev Used to indicate that the content linked to is the previous part of the current document or page.
<a href="sample.html" rel="alternate">Sample Link</a>

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