Robin’s HTML 4.0 Conformance Test

Test your Web browser’s support for features new to version 4.0 of HTML, the predominant markup language for documents on the World Wide Web.

No Web browser fully supports HTML 4.0 yet, though it became an official standard as far back as 18 December 1997. The latest generation is XHTML 1.1, a modular reformulation of HTML as an application of XML.

Latest Updates

4 December 2006

Cursorily tested Netscape 8.1.2.

Replaced results for Mozilla with its successor SeaMonkey.

Made a couple minor corrections here and there.

25 November 2006

Tested Internet Explorer 7.0, Firefox 2.0, Opera 9.02.

Internet Explorer 7.0 has a new interface with tabs and a search bar like Firefox and Opera, many CSS compliance bugfixes, and a couple improvements in HTML compliance:

  • finally supports <abbr>
  • fixed bug rendering all nested <object>s
  • supports label attribute of <option>
  • now supports obsolete text/ecmascript content type (but still neither application/javascript nor application/ecmascript)

Alas, it remains the only major browser with no support for <q>. For years to come, HTML instructors will continue to tell students, Don’t use <q> because Internet Explorer doesn’t support it.