HTML 5

2007-12-03 22:31:49

HTML3到4变化巨大，4到5会更大，估计很多人心理上不大会接受：html 4 + 已经很强大了，为何要搞一套新东西呢？
摘自 http://www.crockford.com/html/

No more doctypes.    Great，我从来就没有完全搞清楚那些doctype

script
 一个html只支持一种类型的script了(微软搞的ie能同时并存js,vbs，还能互相调用，绝对是专家级的技术)，<script>没有属性了
 <script> tags are not immediately executed. <script> tags do not block loading of other assets.
 When the </head> is reached, all of the scripts that were included in the head are then executed in order. When the </body> is reached, all of the scripts that were included in the body are then executed in order.
 明确了

 No more document.write. No more in-page event handlers. No more : urls.
 支持，难看的document.write

Frame
 No more framesets, frames, or ｉｆｒａｍｅs. The security properties of these were problematic. Instead we'll have modules.
 如何实现类似frame呢？看Modules

Modules
 <module> creates a sub-tree which can contain a document with a communication channel. See http://json.org/module.html for a description.
 似乎是ｉｆｒａｍｅ+ ajax，更强大了

CSS
 The default CSS content needs to be standardized.
 现在的css太复杂了,实现一个功能没有人说清楚一共有多少种实现

Encoding
 The only character encoding permitted in HTML 5 is UTF-8.
 HOHOHO

Entities, Empty Tags, Custom Tags, Custom Attributes
 .......