W3C Validation Error on HTML-tag

Hello. I’m using the plugin and are very happy with it, but when I validate my site on https://validator.w3.org/nu/ i get error warnings on the html-tag. It says that xmlns:og and xmlns:fb is not allowed on the html-tag. Is there a way around this? Are those things necessary? Can they be removed some way?

https://ww.wp.xz.cn/plugins/wonderm00ns-simple-facebook-open-graph-tags/