Even w3fools.com has conceded that the big problems have long been fixed and it's okay now: "Today, W3Schools has largely resolved these issues and addressed the majority of the undersigned developers' concerns. For many beginners, W3Schools has structured tutorials and playgrounds that offer a decent learning experience."
Common sentiment in, oh 2013 or so.
Even w3fools.com has conceded that the big problems have long been fixed and it's okay now: "Today, W3Schools has largely resolved these issues and addressed the majority of the undersigned developers' concerns. For many beginners, W3Schools has structured tutorials and playgrounds that offer a decent learning experience."