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探究CSS发展史以及优势
本文向大家描述一下CSS的发展历程，从1990年代初HTML被发明开始样式表就以各种形式出现了，1997年初，W3C内组织了专门管CSS的工作组，到2007年为止，第三版还未完备。
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CSS的发展历程
CSS历史
从1990年代初HTML被发明开始样式表就以各种形式出现了，不同的浏览器结合了它们各自的样式语言，读者可以使用这些样式语言来调节网页的显示方式。一开始样式表是给读者用的，最初的HTML版本只含有很少的显示属性，读者来决定网页应该怎样被显示。
但随着HTML的成长，为了满足设计师的要求，HTML获得了很多显示功能。随着这些功能的增加外来定义样式的语言越来越没有意义了。
1994年哈坤·利提出了CSS的最初建议。伯特·波斯（BertBos）当时正在设计一个叫做Argo的浏览器，他们决定一起合作设计CSS。
当时已经有过一些样式表语言的建议了，但CSS是第一个含有“层叠”的主意的。在CSS中，一个文件的样式可以从其他的样式表中继承下来。读者在有些地方可以使用他自己更喜欢的样式，在其他地方则继承，或“层叠”作者的样式,这种层叠的方式使作者和读者都可以灵活地加入自己的设计，混合各人的爱好。
哈坤于1994年在芝加哥的一次会议上第一次展示了CSS的建议，1995年他与波斯一起再次展示这个建议。当时W3C刚刚建立，W3C对CSS的发展很感兴趣，它为此组织了一次讨论会。哈坤、波斯和其他一些人（比如微软的托马斯·雷尔登）是这个项目的主要技术负责人。1996年底，CSS已经完成。1996年12月CSS要求的第一版本被出版。
1997年初，W3C内组织了专门管CSS的工作组，其负责人是克里斯·里雷。这个工作组开始讨论第一版中没有涉及到的问题，其结果是1998年5月出版的第二版要求。到2007年为止，第三版还未完备。
使用CSS+DIV的优点
采用CSS+DIV进行网页重构相对与传统的TABLE网页布局而具有以下3个显著优势：
◆表现和内容相分离将设计部分剥离出来放在一个独立样式文件中，HTML文件中只存放文本信息。这样的页面对搜索引擎更加友好。
◆提高页面浏览速度对于同一个页面视觉效果，采用CSS+DIV重构的页面容量要比TABLE编码的页面文件容量小得多，前者一般只有后者的1/2大小。浏览器就不用去编译大量冗长的标签。
◆易于维护和改版你只要简单的修改几个CSS文件就可以重新设计整个网站的页面。
感性体验CSS
什么是CascadingStyleSheets（层叠样式表）*CSS是CascadingStyleSheets(层叠样式表)的简称.*CSS语言是一种标记语言,它不需要编译,可以直接由浏览器解释执行(属于浏览器解释型语言).*在标准网页设计中CSS负责网页内容(XHTML)的表现.*CSS文件也可以说是一个文本文件,它包含了一些CSS标记,CSS文件必须使用css为文件名后缀.*可以通过简单的更改CSS文件,改变网页的整体表现形式,可以减少我们的工作量,所以她是每一个网页设计人员的必修课.*CSS是由W3C的CSS工作组产生和维护的.
如何将样式表加入到网页
可以用以下三种方式将样式表加入您的网页。而最接近目标的样式定义优先权越高。高优先权样式将继承低优先权样式的未重叠定义但覆盖重叠的定义。例外请参阅!important声明。链入外部样式表文件(LinkingtoaStyleSheet)你可以先建立外部样式表文件（.css），然后使用HTML的link对象。示例如下：
viewplaincopytoclipboardprint?
文档标题 title> </li> <li><linkrellinkrel=stylesheethref=</li> <li>"http://www.dhtmlet.com/dhtmlet.css"type="text/css"> </li> <li> head> </li> <li><head> </li> <li><title>文档标题 title> </li> <li><linkrellinkrel=stylesheethref=</li> <li>"http://www.dhtmlet.com/dhtmlet.css"type="text/css"> </li> <li> head> </li> <li> </li> </ol></pre><p> 而在XML中，你应该如下例所示在声明区中加入： 定义内部样式块对象(EmbeddingaStyleBlock)你可以在你的HTML文档的和标记之间插入一个块对象。定义方式请参阅样式表语法。示例如下：定义内部样式块对象(EmbeddingaStyleBlock)你可以在你的HTML文档的和标记之间插入一个块对象。定义方式请参阅样式表语法。示例如下：</p><p>viewplaincopytoclipboardprint?</p><pre> <ol> <li><html> </li> <li> <head> </li> <li> <title>文档标题 title> </li> <li> <styletypestyletype="text/css"> </li> <li> 深入<em>探究</em>交换机技术<em>发展史</em> 与桥接器不同的是交换机技术转发延迟很小，操作接近单个局域网性能，远远超过了普通桥接互联网络之间的转发性能。 <p>2010-01-05 15:43:08</p> 交换机技术</li> </ol></pre> <br> 当前题目：探究CSS发展史以及优势 <br> 文章位置：<a href="http://jxjierui.cn/article/coghdjo.html">http://jxjierui.cn/article/coghdjo.html</a> </div> <div class="hot_new"> <div class="page_title clearfix"> 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12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\BuildLiteBehavior [ RunTime:0.000004s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --END-- [ RunTime:0.000025s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000148s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --END-- [ RunTime:0.000160s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ContentReplaceBehavior [ RunTime:0.000053s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --END-- [ RunTime:0.000072s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ParseTemplateBehavior [ RunTime:0.003623s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --END-- [ RunTime:0.003639s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000063s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --END-- [ RunTime:0.000073s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_end ] --START--</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: pid /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php 第 47 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/383ea05405bb577d8b8ec19f0a4746dd.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_host /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 120 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_port /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 121 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_name /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 122 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/d70f45218f1f59d5c83b7d71454aacd7.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> </div> </div> <div id="think_page_trace_close" style="display:none;text-align:right;height:15px;position:absolute;top:10px;right:12px;cursor: pointer;"><img style="vertical-align:top;" 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3ukcXd5s7LvLD3me61WkuTCpJzYAyRurMB44EdEJzTfU271lUJC03YjXJXzYOGZwN4D8eB5jlfLrdWfzGRW7icMPfiSO6Oe7s20bmhdgLX4Z23B+s3JgQESzUDiMboSzDMHFpNMwccGePauhfwjzwnI2wu9zKGgEFg80jcZ7MHllk07s1H+5yojtUQTlH4nFdLKTGwDmPbIklOb1L1zO4T6N8NCuDLFLS/C63c0eNRimZ++s5BMBHxU11jHchI9oFVUxRh/eMDzHEzGYu0Lg8gJ7oS/tFCwoic44fyUtix0n/46vP4bf+//BRgAYwDDar4ncHIAAAAASUVORK5CYII="></div> 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