The pages in this site are written in an extended form of XHTML 1.0, which is machine-translated into plain XHTML and also into equivalent HTML 4.01. The stylesheets are written in CSS 2.1. Images are most commonly in Portable Network Graphics format. Flavor images are generally drawn or rendered with the GIMP. GNU Emacs is used as the primary text editor, with nXML mode for editing the pages.
Content negotiation (2, 3) is used for many resources to serve different versions of content depending on the capabilities of the client. This is used to determine whether the XHTML or HTML versions of pages are sent, for instance.
On a side note, the site maintainer wishes to register his displeasure at the inability of many modern browsers to properly parse object tags for images, especially in combination with content negotiation. img tags are therefore reluctantly used instead, despite the minor loss of conceptual cleanliness that results.