HTML5

1.form新增的常用属性form，formaction，formmethod,placeholder,autofocus,list,autocomplete

2.改良的input的属性search,tel,date,month,week,time,datetime-local,url,email,number,range,color,file,audio,video

3.新增的其他mark,wbr,progress,meter,canvas,command,ruby

4,html5废除的元素

basefont,big,center,font,strike,tt,u,frameset,frame,noframes,bgsound,marquee