由于缺少結構，即使是形式良好的 HTML 頁面也比較難以處理。必須分析標題的級別，才能看出各個部分的劃分方式。邊欄、頁腳、頁眉、導航條、主內容區和各篇文章都由通用的 div 元素來表示。HTML 5 添加了一些新元素，專門用來標識這些常見的結構： section：這可以是書中的一章或一節，實際上可以是在 HTML 4 中有自己的標題的任何東西 header：頁面上顯示的頁眉；與 head 元素不一樣 footer：頁腳；可以顯示電子郵件中的簽名 nav：指向其他頁面的一組鏈接 article：blog、雜志、文章匯編等中的一篇文章 我們來考慮一個典型的 blog 主頁，它的頂部有頁眉，底部有頁腳，還有幾篇文章、一個導航區和一個邊欄，見代碼1 典型的 blog 頁面 html head title Mokka mit Schlag /title /head body div id= page div id= header h1 a href= http://www.elharo.com/blog Mokka mit Schlag /a /h1 /div div id= container div id= center > div > h2 a href= /blog/birding/2007/04/23/spring-comes-and-goes-in-sussex-county/ Spring Comes (and Goes) in Sussex County /a /h2 div > p Yesterday I joined the Brooklyn Bird Club for our annual trip to Western New Jersey, specifically Hyper Humus, a relatively recently discovered hot spot. It started out as a nice winter morning when we arrived at the site at 7:30 A.M., progressed to Spring around 10:00 A.M., and reached early summer by 10:15. /p /div /div div > h2 a href= /blog/birding/2007/04/23/but-does-it-count-for-your-life-list/ But does it count for your life list? /a /h2 div > p Seems you can now go a href= http://www.wired.com/science/discoveries/news/ 2007/04/cone_sf bird watching via the Internet /a . I haven't been able to test it out yet (20 user limit apparently) but this is certainly cool. Personally, I can't imagine it replacing actually being out in the field by any small amount. On the other hand, I've always found it quite sad to meet senior birders who are no longer able to hold binoculars steady or get to the park. I can imagine this might be of some interest to them. At least one elderly birder did a big year on TV, after he could no longer get out so much. This certainly tops that. /p /div /div /div div > div > a href= /blog/page/2/ _fcksavedurl= /blog/page/2/ Previous Entries /a /div div > /div /div div id= right > ul id= sidebar li h2 Info /h2 ul li a href= /blog/comment-policy/ Comment Policy /a /li li a href= /blog/todo-list/ Todo List /a /li /ul /li li h2 Archives /h2 ul li a href='/blog/2007/04/' April 2007 /a /li li a href='/blog/2007/03/' March 2007 /a /li li a href='/blog/2007/02/' February 2007 /a /li li a href='/blog/2007/01/' January 2007 /a /li /ul /li /ul /div div id= footer p Copyright 2007 Elliotte Rusty Harold /p /div /div /body /html 即使有正確的縮進，這些嵌套的 div 仍然讓人覺得非常混亂。在 HTML 5 中，可以將這些元素替換為語義性的元素，見代碼2 用 HTML5編寫的典型blog頁面 html head title Mokka mit Schlag /title /head body header h1 a href= http://www.elharo.com/blog Mokka mit Schlag /a /h1 /header section article h2 a href= /blog/birding/2007/04/23/spring-comes-and-goes-in-sussex-county/ Spring Comes (and Goes) in Sussex County /a /h2 p Yesterday I joined the Brooklyn Bird Club for our annual trip to Western New Jersey, specifically Hyper Humus, a relatively recently discovered hot spot. It started out as a nice winter morning when we arrived at the site at 7:30 A.M., progressed to Spring around 10:00 A.M., and reached early summer by 10:15. /p /article article h2 a href= /blog/birding/2007/04/23/but-does-it-count-for-your-life-list/ But does it count for your life list? /a /h2 p Seems you can now go a href= http://www.wired.com/science/discoveries/news/ 2007/04/cone_sf bird watching via the Internet /a . I haven't been able to test it out yet (20 user limit apparently) but this is certainly cool. Personally, I can't imagine it replacing actually being out in the field by any small amount. On the other hand, I've always found it quite sad to meet senior birders who are no longer able to hold binoculars steady or get to the park. I can imagine this might be of some interest to them. At least one elderly birder did a big year on TV, after he could no longer get out so much. This certainly tops that. /p /article nav a href= /blog/page/2/ _fcksavedurl= /blog/page/2/ Previous Entries /a /nav /section nav ul li h2 Info /h2 ul li a href= /blog/comment-policy/ Comment Policy /a /li li a href= /blog/todo-list/ Todo List /a /li /ul /li li h2 Archives /h2 ul li a href='/blog/2007/04/' April 2007 /a /li li a href='/blog/2007/03/' March 2007 /a /li li a href='/blog/2007/02/' February 2007 /a /li li a href='/blog/2007/01/' January 2007 /a /li /ul /li /ul /nav footer p Copyright 2007 Elliotte Rusty Harold /p /footer /body /html 現在不再需要 div 了。不再需要自己設置 class 屬性，從標準的元素名就可以推斷出各個部分的意義。這對于音頻瀏覽器、手機瀏覽器和其他非標準瀏覽器尤其重要。
