2-网页布局与美化--xhtml与css基础

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1、March,2008ITEducation&Training陈伟卫chenweiwei@neusoft.edu.cnITEducation&Training2—XHTML与CSS基础主要内容1、复习2、XHTML基础3、良好的XHTML编写习惯4、CSS语法结构（一）5、CSS综合案例一1、复习1)Web标准的构成有哪三个部分？2)XHTML的文档类型？3)CSS和表格布局的区别是什么?2、标准XHTML代码解析

2、/DTD/xhtml1-transitional.dtd">标准ＸＨＴＭＬ代码解析认真阅读代码，理解每部分的含义名字空间小王和小李都定义了一个标识，如果小王的名字空间是"http://www.xiaowang.com"，小李的名字空间是"http://www.

3、xiaoli.com"，那么当两个文档交换数据时，也不会混淆标识，因为它属于不同的名字空间。更通俗的解释是：名字空间就是给文档做一个标记，告诉别人，这个文档是属于谁的。只不过这个"谁"用了一个网址来代替。正确DOCTYPE声明的作用要建立符合标准的网页，DOCTYPE声明是必不可少的关键组成部分；除非你的XHTML确定了一个正确的DOCTYPE，否则你的标识和CSS都不会生效。3、良好的XHTML编写习惯p381.所有的标记都必须要有一个相应的结束标记

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2、所有标签的元素和属性的名字都必须使用小写XHT

4、ML对大小写是敏感的，和<TITLE>是不同的标签3、所有的属性必须用引号””括起来<height=“80”>4、所有的XML标记都必须合理嵌套<p><b></b></p>就是说，一层一层的嵌套必须是严格对称4、CSS简介CSS是CascadingStyleSheets(层叠样式表)的缩写。是一种对web文档添加样式的简单机制，属于表现层的布局语言。CSS语法结构p391.基本语法规范p{text-align:center;color:black;font-family:arial;}选择符（Selector）属性(Property)值（Value）id和class</p><p>5、选择符p421）id选择符使用#符号进行标识，基本作用是对页面中的唯一元素进行定义。例如：#content{font-size:14px;line-height:130%}……<divid=“content”>……</div>id和class选择符2）class选择符使用.符号的形式定义，允许重复，多个元素可以共用一个class定义。例如：.p{margin:10px;background-color:blue;}……<divclass=“p1”>……</div><h1class=“p1”>……</h1><h3class=“p1”>……</h3>5、CSS综合案例一体验CSS第一</p><p>6、步：创建简单的html页面css-1.html第二步：添加一幅图片css-2.html第三步：首先控制文档的背景颜色css-3.html第四步：控制标题和文本css-4.html第五步：控制图问混排的效果css-5.html第六步：实现图片的滤镜效果，让文档过渡自然。css-6.html通过六个步骤的不断完善，让简单的网页亮丽起来！</p> </div> <div class="mt-3 bg-white"> <div class="d-lg-block d-none px-3 px-lg-4 py-3 border-bottom text-center font-18"> 当前文档最多预览五页，下载文档查看全文 </div> <div class="detail-fixed-feature d-none d-lg-block" id="detailFixedFeatureBox"> 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