Sorry for the very basic question.
I have a test page that does not have a doctype tag but instead has
<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>.
I attached the file.
The W3 validator does not like it because of the absence of a doctype tag.
Can't <meta http-equiv='Content-Type' content='text/html; charset=UTF-8'> replace the doctype? Why not?
If not, I do not know what doctype to put there because the code was automatically generated by the widely popular page:
http://stevemorse.org/create/create.htmltest.html