Legals aside, ultimately you're (where 'you' == 'the company') responsible for what ends up on your website.
What I'm saying that this is more nuanced in practice. If you look at the JS console on some sites I work on at my company, you could come to the conclusion that we're bad developers because of all the JS errors you would see. Unfortuantly, they're made by others and we (developers) get little choice in the matter.
I am not a lawer. This is not legal advice.