I read the question at What is the HTML5 alternative to the obsolete meta http-equiv=content-language. but it does not answer my question. So, if I have a simple site of 4 index pages, each one in a different language, how do I specify the language? "Consider specifying the language on the root element instead" means to specify at every div?
<META HTTP-EQUIV="Content-Language" content="EN">
So, it mus look like that:
<html lang="en-GB">