Articles particular to XHTML, rather than just HTML
May also depend on a particular HTML layout, but predominantly implemented using CSS
General page layouts. Two column fluid, three column fixed, with headers and footers or without. Is it HTML? Is it CSS? Well, it's very much both and warranted its own category. Some of these layouts are to a specific design, rather than a generic n-column fluid/fixed layout.
Subset of JavaScript
declare construct with the ticks directive.Test pages not necessarily testing any particular method...
Pages demonstrating a particular task, perhaps pulling together a combination of HTML/CSS/JavaScript/PHP methods that could be developed further.
This has now be detached into a separate reference page of links. External links related to the topics discussed above can be found in the relevant pages.