Nah, the <html> element doesn't represent "all of HTML" or anything it just means "the root element of the document" - just another element. As someone else not

Nah, the <html> element doesn't represent "all of HTML" or anything it just means "the root element of the document" - just another element. As someone else noted it's not actually even required to have a valid error-free HTML document, for that only <!doctype html> and a valid <title> are. An analogy might be having a valid understanding and parsing of what "English" as part of an essay heading is unrelated to knowing what "fustigate" means despite the latter being an English word.