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:

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|===
|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

* W3C, https://www.w3.org/TR/html5-diff[Obsolete Features]
* WHATWG, https://html.spec.whatwg.org/multipage/obsolete.html[Obsolete Features]


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== Comments And Links
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