Joomla is a powerful content management system.  That power means lots of settings and customizations.  Some of the quirks I've encountered with Joomla are addressed here.

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1 JOOMLA OSE - Open Source Excellence Membership Control Footer
2 JOOMLA sh404sef - Showing /table/ in url
3 JOOMLA & YOUTUBE - Menu Behind Youtube Video
4 JOOMLA - Wrapper AutoHeight