This is an example page using the HTML 4.01 Plus DTD. HTML 4.01 Plus is the same as HTML 4.01 Strict, but with a few useful additions which (hopefully) won't break your page in existing browsers:
xmlns: attributes are not allowed by this DTD — indeed DTDs in general cannot support XML namespaces. You will just need to ignore validator warnings with regard to namespace attributes.
<!DOCTYPE html PUBLIC "+//IDN buzzword.org.uk//DTD HTML 4.01 Plus//EN" "http://buzzword.org.uk/2008/html4plus.dtd">
This change log is marked up using hCalendar and the
Initial version of this page.
Add http://www.w3.org/1999/xhtml/vocab to document head profile list.
Updated the page to reflect some DTD additions:
The aim is to be a flavour of HTML roughly compatible with, but perhaps a slight superset of, the proposed XHTML 1.2 specification.
Changed public identifier to
"+//IDN buzzword.org.uk//DTD HTML 4.01 Plus//EN".
Added usage information.
Included demonstration use of
Tightened ARIA validation by checking some enumerated attribute values.