I never realized how hard (impossible) it was to even get a modestly complex html table to render correctly in modern browsers: I wrote an account of my frustrations (with screenshots) here.
[ Home | Articles | Account | People | Projects | FAQ ] 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!