<!DOCTYPE html> <acronym> - use <abbr> instead<applet> - use <object> instead<dir> - use <ul> instead<frame>, <frameset>, <noframes> - redesign instead<img> border must be 0 if present<script> language must be "JavaScript" if present<a>,<img> name dropped - use id insteadrev - oft misunderstood/misusedlongdesc - often harms accessibilityprofile - nascent microformats/RDFa use<html> version<meta> scheme<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="UTF-8">sizes attribute - use with rel="icon"<strong> now represents importance rather than emphasis<cite> element<a> more flexible, e.g. hyperlink headings<a>, <area> new media attribute like link<a href="http://m.twitter.com/" rel="alternate" media="handheld"> visit mobile site </a><area> hreflang and rel added like <a>rel for microformatsclass, dir, id, lang, style, tabindex, title
<iframe> for nested HTML<embed> for plugins<base>, <a>, <area> target attribute<li> value attribute<ol> start attribute<ol> new reverse attribute<b> stylistically offset span of text<i> taxonomic designation, a technical term<small> small print (side comments, legal)<hr> paragraph level thematic break<section> (now scopes <address> and headings)<header><footer><nav><article><aside><time datetime>
<ruby>, <rt> and <rp>
<hgroup> - multilevel headings<figure> with
<dt> + <dd>: captions on images<svg> - vector graphics <canvas> - drawing with scripts
<audio> - like img for sound <video> - use src
<source> - with src attribute <progress> - for indicating task progress <meter> - displaying a range <input> types