Устаревшие объявления DOCTYPE

XHTML 1.0 Basic

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN" "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">

<!DOCTYPE html PUBLIC "-//IETF//DTD HTML 2.0//EN">