Comparison of layout engines (Non-standard HTML)

The following tables compare deprecated and proprietary HTML tags and attributes compatibility and support for a number of layout engines. Please see the individual products' articles for further information. This article is not all-inclusive or necessarily up-to-date. Unless otherwise specified in footnotes, comparisons are based on the stable versions without any add-ons, extensions or external programs.

In the early years of the World Wide Web, the standards which today are used in most web browsers and web pages were mostly non-existent. Different browsers and HTML editors were being offered by competing vendors such as Netscape, Microsoft and WebTV, all of whom possessed their own ideas for how web sites should be constructed. These varying standards resulted in web developers coding for specific web browsers, using tags which could often be recognized by only one browser.

Deprecated HTML tags

Trident support notes

* isn't supported for IE5.0 [http://de.selfhtml.org/html/text/zeilenumbruch.htm#erlauben]

Gecko support notes

* is only supported with the "Stop Autoplay" - Extension [https://addons.mozilla.org/firefox/addon/1765]

Proprietary HTML attributes

References

* [http://www.devguru.com/technologies/html/quickref/html_other_tags.html DevGuru HTML - Non-standard tags]
* [http://victor.transformadora.com/Oreilly/wdesign/wdesign/appd_01.htm Web Design in a Nutshell, 2nd Edition - Microsoft Internet Explorer Proprietary Tags]
* [http://victor.transformadora.com/Oreilly/wdesign/wdesign/appd_02.htm Web Design in a Nutshell, 2nd Edition - Netscape Navigator Proprietary Tags]
* [http://www.seds.org/~spider/os2/webextag.html OS/2 Web Explorer's proprietary html tags]

ee also

*Web standards