Editing HTML (section)

==== HTML 4 ====
:; December 18, 1997: HTML 4.0<ref>{{cite web |url=https://www.w3.org/TR/REC-html40-971218/|title=HTML 4.0 Specification|publisher=World Wide Web Consortium|date=December 18, 1997|access-date=November 16, 2008}}</ref> was published as a W3C Recommendation. It offers three variations:
:;* Strict, in which deprecated elements are forbidden
:;* Transitional, in which deprecated elements are allowed
:;* Frameset, in which mostly only [[Framing (World Wide Web)|frame]] related elements are allowed.
:Initially code-named "Cougar",<ref name="engelfriet">{{cite web|url=http://htmlhelp.com/reference/wilbur/intro.html|title=Introduction to Wilbur|first=Arnoud |last=Engelfriet|authorlink=Arnoud Engelfriet|website=htmlhelp.com|access-date=June 16, 2007}}</ref> HTML 4.0 adopted many browser-specific element types and attributes, but also sought to phase out Netscape's visual markup features by marking them as [[deprecation|deprecated]] in favor of style sheets. HTML 4 is an SGML application conforming to ISO 8879&nbsp;– SGML.<ref>{{cite web|url=https://www.w3.org/TR/html4/conform.html#h-4.2|title=HTML 4 – 4 Conformance: requirements and recommendations|access-date=December 30, 2009}}</ref>
:;April 24, 1998
: HTML 4.0<ref>{{cite web |url=https://www.w3.org/TR/1998/REC-html40-19980424/|title=HTML 4.0 Specification|publisher=World Wide Web Consortium|date=April 24, 1998|access-date=November 16, 2008}}</ref> was reissued with minor edits without incrementing the version number.
:; December 24, 1999: HTML 4.01<ref>{{cite web |url=https://www.w3.org/TR/html401/|title=HTML 4.01 Specification|publisher=World Wide Web Consortium|date=December 24, 1999|access-date=November 16, 2008}}</ref> was published as a W3C Recommendation. It offers the same three variations as HTML 4.0 and its last errata<ref>{{cite web |title=HTML 4 Errata |url=https://www.w3.org/MarkUp/html4-updates/errata |publisher=W3C |access-date=March 2, 2023}}</ref> were published on May 12, 2001.
:; May 2000: ISO/IEC 15445:2000<ref name="iso-html">{{cite web |url=https://www.iso.org/standard/27688.html |title= ISO/IEC 15445:2000 – Information technology – Document description and processing languages – HyperText Markup Language (HTML) |author=ISO |year=2000|access-date=March 1, 2023}}</ref> ("[[International Organization for Standardization|ISO]] HTML", based on HTML 4.01 Strict) was published as an ISO/IEC international standard.<ref>{{cite web |title=ISO/IEC 15445:2000(E) ISO-HTML |url=https://www.scss.tcd.ie/misc/15445/15445.HTML |website=www.scss.tcd.ie |publisher=ISO/IEC |access-date=March 1, 2023 |location=Geneva, CH |language=EN |date=May 15, 2000}}</ref> In the ISO, this standard is in the domain of the [[ISO/IEC JTC 1/SC 34]] (ISO/IEC Joint Technical Committee 1, Subcommittee 34&nbsp;– Document description and processing languages).<ref name="iso-html" />
:;: After HTML 4.01, there were no new versions of HTML for many years, as the development of the parallel, XML-based language XHTML occupied the W3C's HTML Working Group.