How can I check HTML5 directly in Vim?

Of course, you can use the old old online tools such as the W3C Validator, but I think it would be more efficient to check directly in Vim.

I tried a built-in HTML check plugin called "Syntax", which defaulted to HTML Tidy. Although this seems to work, I found out that HTML Tidy does not actually support HTML5, and the solution looks more like a hack. Please let me know if I am wrong.

However, I also found a rather old article about using an online service in Vim:

http://blog.whatwg.org/vim-checker

Although this hasn’t worked for me yet, I think you can make it work with Syntastic.

Last but not least, I checked the Internet for some applications on the command line, and that’s all I found:

http://about.validator.nu/html5check.py

A script that uploads a file to the same online service and displays errors on the command line.

Do any of you know if I can even make this script work with syntax or Vim in general? Or does anyone know a different solution? A walkthrough would be really cool.

thanks in advance