XHTML
From MediaWiki.org
MediaWiki has delivered XHTML 1.0 Transitional code since version 1.3, with small fixes and improvements towards better compliance along the way. For a full discussion see wikipedia's XHTML entry.
[edit] Benefits of XHTML compliance in MediaWiki
- elements from different XML namespaces (such as MathML and Scalable Vector Graphics) can be incorporated within articles
- despite being a seperate specification, XHTML is viewed as the 'current' (most up-to-date) version of HTML
- XHTML is required for many resource contrained / small form factor browsers
- much easier to transform (via XSLT, etc) into other formats
[edit] Negative aspects of delivering XHTML in MediaWiki
- older browsers break when using XHTML mimetype
- many javascript extensions are dependant on html, and would have to be updated to use DOM
- parsing of user supplied XHTML would have to become much stricter, badly formed markup can break an entire page
somewhat related settings :

