Are you still confused also being obsessed on HTML5 and everythings about it? Here are the good graphic ilustrations about HTML5 on single images (beware, its a large graphics).
Look yourself at: http://media.focus.com/images/uploaded/fyi/wtf-html5-infographic/HTML5__.jpg
Or read the comprehensive article about the graphics at: http://www.focus.com/images/view/11905/