Hi François, > >> Use: RTE.default.buttons.blockstyle.tags.tr.allowedClasses or, for any >> block element: >> RTE.default.buttons.blockstyle.tags.[tag-name].allowedClasses > > Excellent! Is that only for TYPO3 4.2 or was it already the case with 4.1? > This applies only since TYPO3 4.2. Regards, Stanislas