This document lists which browsers are fully supported by a given Joomla release. In general all code should be written in a way that the content is still accessible in older browsers as well. In case Joomla doesn't work with one of the listed browser please file a bug report.
In general we will only support the newest releases of Opera and Chrome. For Internet Explorer, Firefox and Safari the current browser version at the time of Joomla's release and all future versions are supported. Also selected older versions are supported based on market share.
Note: Information for feature version may change up to the date of the release
As of released date, July 2012. Joomla! 3.0, 3.1, and 3.2 are STS releases working towards the Spring of 2014 release of the LTS 3.5.
As of released date, January 2012. Joomla! 2.5 is a LTS release with support until December, 2014.