If this flag is set to False, <B>, <EM>, <I>, <STRONG>, <S>, <STRIKE>, <TT>, <ABBR>, <ACRONYM>, <CITE>, <CODE>, <DEL>, <DFN>, <INS>, <SAMP>, <BDO>, <RT>, <RUBY>, <U>, <BIG>, <SMALL>, <SUB>, <SUP>, <PRE>, <PLAINTEXT>, <XMP>, <Q>, <LISTING>, <BLOCKQUOTE>, <NOBR> and <WBR> tags will removed from the HTML. Default is TRUE. This property also determines whether the editing user interface (UI) enables these operations.