TYPO3 v7 RTE Rich text editor: Disallow tags and attributes

# Put this into Page TSConfig
 
# Rich Text Editor configuration
# https://docs.typo3.org/typo3cms/extensions/rtehtmlarea/Configuration/PageTsconfig/interfaceConfiguration/Index.html
# https://docs.typo3.org/typo3cms/CoreApiReference/Rte/Transformations/Index.html
# https://docs.typo3.org/typo3cms/TyposcriptReference/Functions/Htmlparser/Index.html
 
RTE.default {
    showButtons = bold, strong, emphasis, italic, unorderedlist, link, unlink, chMode
    RTEHeightOverride = 300
 
    proc {
        # allowTags gets added to the built-in list, so we use denyTags
        # default allowtags:
        #  a,b,blockquote,br,center,div,em,font,hr,i,img,li,ol,p,pre,span,strike,strong,sub,sup,u,ul
        denyTags = blockquote, center, div, font, h1, h2, h3, h4, h5, h6, hr, img, ol, pre, span, strike, sub, sup, strike, u
 
        entryHTMLparser_db = 1
        entryHTMLparser_db {
            removeTags < RTE.default.proc.denyTags
            noAttrib = b, br, div, em, i, li, p, strong, ul
            tags >
            # prevent activation of RteHtmlParser::transformStyledATags()
            tags.a.allowedAttribs = href,title,target
        }
    }
}