basefont, big, blink, center, font, marquee, multicol, nobr, spacer, tt

use CSS

acronym

use abbr

applet

use embed or object

bgsound

use audio

frame, frameset, noframes

restructure the page to remove frames

isindex

use form controls

dir

use ul

hgroup

use header or div

listing

use pre and code

nextid

use GUIDS

noembed

use object instead of embed when fallback is necessary

plaintext

use the "text/plain" MIME type

strike

use del or s

xmp

use pre or code, and escape "<" and "&" characters