I put an error check into my validator that w3 doesn't do: if XHTML is sent as text/html, the error viewer shows an error message. Now I only have to fix every single site I've written in the past two years....
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!