I know they're not the best resource out there, but when I want to provide a quick link on how a tag is used, they're an excellent resource. I recently used an alternative but damn if it isn't harder to parse than the matching W3Schools link for the same tag.
I know we have a lot of hate for W3Schools. Am I going to be downvoted for using an accurate and helpful link with a proper explanation of the link's content if it happens to be from W3Schools?
Short of creating my own wiki with working examples and a full appendix of HTML tags and attributes "just use a better link" isn't always a workable solution.