HTML 5 Introduction
What's is HTML5
<!DOCTYPE html>
Add more description tags:
<header>
<footer>
<nav>
<section>
<article>
<aside>
custom data attribute ( data- )
<meter>
<progress>
remove some tags:
basefont, big, center, font, s, strike, tt, u (表现元素)
frame, frameset, noframes(框架元素)
align; body标签上的link, vlink, alink, text; bgcolor; height和width; iframe元素上的scrolling属性; valign; hspace和vspace; table标签上的cellpadding, cellspacing和border属性(表现属性)