Up until version 3.8.x, RTE (Rich-Text Editor) was the standard tool for entering and designing content. With TYPO3 4.0 it was replaced by the HMTLArea RTE. A lot of users are still working with older TYPO3 versions, which is why we will take a look at the configuration of RTE.
We are not going to explain how to use this editor, only how to customize it, for which there are numerous options.
RTE can be configured on three levels: