HTML 4.01 Plus

Experimental

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:

HTML 5 <time> Element
RDFa, including xml:lang
XHTML role Attribute
ARIA
HTML 4.01 (Transitional) target Attribute
XHTML Basic 1.1 inputmode Attribute
XHTML <access> Element
XML Events 2 implements Attribute
Ruby

Note that 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.

Usage

<!DOCTYPE html
	PUBLIC "+//IDN buzzword.org.uk//DTD HTML 4.01 Plus//EN" 
	"http://buzzword.org.uk/2008/html4plus.dtd">

Changes

This change log is marked up using hCalendar and the <time> element.

29 Jun 2008: Initial version of this page.

17 Jul 2008: Add http://www.w3.org/1999/xhtml/vocab to document head profile list.

31 Jul 2008

Updated the page to reflect some DTD additions:

XHTML role Attribute
ARIA
HTML 4.01 (Transitional) target Attribute
XHTML Basic 1.1 inputmode Attribute
XHTML <access> Element
XML Events 2 implements Attribute

The aim is to be a flavour of HTML roughly compatible with, but perhaps a slight superset of, the proposed XHTML 1.2 specification.

03 Aug 2008

Changed public identifier to "+//IDN buzzword.org.uk//DTD HTML 4.01 Plus//EN".

Added usage information.

07 Aug 2008: Added Ruby [Ruby Annotation].

08 Aug 2008: Included demonstration use of @implements.

19 Aug 2009

Tightened ARIA validation by checking some enumerated attribute values.

Added xml:lang attribute.