HTML::Tagset does not recognize HTML element unique to HTML5. Please
update the module so that it recognizes the new elements as well as the
old ones:
https://www.w3schools.com/html/html5_new_elements.asp
I am not sure if they should just be mixed in with the HTML4 elements or
if the module should have a separate mode for HTML5, have some elements
have been removed too?
/Lars