Care to explain why this was downvoted? I honestly don't understand how did the authors manage to make a skeleton (!) page not passing validation. Even <title>

Care to explain why this was downvoted? I honestly don't understand how did the authors manage to make a skeleton (!) page not passing validation. Even <title> is empty when it must not be so. Is it because of Angular? Well, if a framework forces you to write invalid HTML (tags, attributes, whatever), it sucks, no matter what.