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Created attachment 143218 [details] screenshot of the issue When placing a twig variable in an attribute in a .twig document, the validation engine treats it as a whitespace and throws an error.
HTML validation shouldn't be used in files which are not pure html (that's why it's disabled by default).
I'm afraid it's not. I have fresh install of NB 7.4 and the html validation was enabled already. Secondly, this is a .twig template file, which is usually consists mostly of html and some twig code. I this case it needs some sort of validation, since it's front end work.