With the advent of HTML5, many old elements were deprecated. To ensure the best user experience, deprecated elements should not be used. This rule checks for the following deprecated elements:

Element Remediation Action
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

See