W3C CSS validation errors

Hello guys,

Has anyone encountered this errors before?

https://preview.webflow.com/preview/ecoqueens?preview=f182002aaf9ab6198069e47208bf6724

They are added to support different types of non-standard browsers as well. Don’t worry about them.

Because this technology’s specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
user-select - CSS: Cascading Style Sheets | MDN

Though present in early (2002) drafts of CSS3 Fonts, font-smooth has been removed from this specification and is currently not on the standard track.
Can I use... Support tables for HTML5, CSS3, etc

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