Strict
11 elements removed APPLET, BASEFONT, CENTER, DIR, FONT, IFRAME, ISINDEX, MENU, S, STRIKE, and U.
Transitional
keeps 11 elements APPLET, BASEFONT, CENTER, DIR, FONT, IFRAME, ISINDEX, MENU, S, STRIKE, and U.
Frameset
Three (3) elements are added when compared to Strict: FRAME, FRAMESET and NOFRAMES, Also the BODY tag is replaced with the FRAMESET element