Rails每周闲碎(五): Http, Html, Browser, etc
1. 浏览器的回退为了避免数据不一致问题，我想到的只有强制禁用浏览器cache（cache control：no cache, no store）。
2. Why and how the url is encoded:
http://www.blooberry.com/indexdot/html/topics/urlencoding.htm
and so why some special characters needed to be encoded in HTML? space -> &nbsp. :)
3. label
html中的label之所以要ID对应，是因为
The label element does not render as anything special for the user.However, it provides a usability improvement for mouse users, becauseif the user clicks on the text within the label element, it toggles thecontrol.
<label for="male">Male</label><input type="radio" name="sex" id="male" />
4. textarea
oninput和onpropertychange (IE)事件。
5. http keepAlive
Http connection is NOT dropped, but is instead kept open. When the client sends another request, it uses the same connection. This will continue until either the client or the server decides that the conversation is over, and one of them drops the connection.
在Http1.1中，这是默认的。
6. cdata
对XHTML兼容，又对现在不支持XHTML的浏览器兼容的方式。
<script type="text/javascript">//<!]> </script>
http://www.cnblogs.com/scugzbc/archive/2008/07/13/1242063.html
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