All pages validate as strict XHTML 1.0. The styles mostly validate as CSS2.

Some code called 10post.php from flippedcracker.net (site no longer operating) was adapted to do the Greymatter "Sidelines" entries listing on the homepage right hand column under the 2 complete Sideline entries.

The php code to convert the Greymatter "Sidelines" to an rss 0.91 feed was written by LS8. By inserting one statement into gm.cgi, the feed is rebuilt every time you call gm.cgi, for example when adding an entry or rebuilding your Greymatter "Sidelines" files. There isn't much simpler php code for turning Greymatter into an rss feed about. The code listing and instructions are here.

There's quite a bit of code around that parses xml with php. LS8 adapts the Zend code at http://www.zend.com/zend/spotlight/code-gallery-wade6.php to sax parse the rss file that creates the links on the homepage, left hand column. (Zend are the people who manage the development of php.)

The graph on the homepage is dynamically built from mysql (for each new session) using Aditus Consulting's jpgraph scripts which rely on the gd library being compiled into php.

Javascript must be enabled for the themes to work at all; cookies must be enabled for the theme choice to be remembered between pages. The themes only work in browsers than can handle styles.