Thanking David for the quick fix of a html-validate issue with acceptable values for the textarea tag’s autocomplete attribute (https://gitlab.com/html-validate/html-validate/-/issues/249).
If you’re not using html-validate, you should. Kitten* has is integrated by default so you get your markup validated on every save and you can see validation errors in the browser (you can even have it highlight the invalid elements visually on the page) :)