vim syntastic: <form> proprietary attribute "novalidate"

Question

I have following vim plugins installed:

• Plugin 'othree/html5.vim'
• Plugin 'scrooloose/syntastic'

however, having following html chunk:

<form novalidate>
</form>

shows:

<form> propritary attribute "novalidate"

To prevent error I have to explicitly say (in my ~/.vimrc):

let g:syntastic_html_tidy_ignore_errors=["<form> proprietary attribute \"novalidate\""]

Still I thought that othree/html5.vim plugin does the job here.

Why is it not so?

Answer 1

No, that html5.vim plugin does nothing related to html tidy at all and nothing in its README supports that idea. It only extends Vim's built-in HTML support with various HTML5 features.

Syntastic being another plugin, it must be customized independently.