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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
与HTML不一样，XHTML对大小写是敏感的，
2007年5月21日星期一
WEB标准教程第6天：XHTML代码规范
.所有的标记都必须要有一个相应的结束标记
以前在HTML中，你可以打开许多标签，例如而不一定写对应的和 来关闭它们。但在XHTML中这是不合法的。XHTML要求有严谨的结构，所有标签必须关闭。如果是单独不成对的标签，在标签最后加一个"/"来关闭它。例如:
2.所有标签的元素和属性的名字都必须使用小写
与HTML不一样，XHTML对大小写是敏感的，和<TITLE>是不同的标签。XHTML要求所有的标签和属性的名字都必须使用小写。例如：<BODY>必须写成<body> 。大小写夹杂也是不被认可的，通常dreamweaver自动生成的属性名字"onMouseOver"也必须修改成"onmouseover"。<br /><br /> 3.所有的XML标记都必须合理嵌套<br /><br /> 同样因为XHTML要求有严谨的结构，因此所有的嵌套都必须按顺序，以前我们这样写的代码：<br /><br /> <p><b></p></b> <br /><br /> 必须修改为：<br /><br /> <p><b></b></p> <br /><br /> 就是说，一层一层的嵌套必须是严格对称。<br /><br /> 4.所有的属性必须用引号""括起来<br /><br /> 在HTML中，你可以不需要给属性值加引号，但是在XHTML中，它们必须被加引号。例如:<br /><br /> <height=80> <br /> <br /> 必须修改为：<br /><br /> <height="80"> <br /><br /> 特殊情况，你需要在属性值里使用双引号，你可以用"，单引号可以使用'，例如：<br /><br /> <alt="say'hello'"> <br /><br /> 5.把所有<和&特殊符号用编码表示<br /> <br /> 任何小于号（<），不是标签的一部分，都必须被编码为& l t ; <br /><br /> 任何大于号（>），不是标签的一部分，都必须被编码为& g t ; <br /><br /> 任何与号（&），不是实体的一部分的，都必须被编码为& a m p; <br /><br /> 注：以上字符之间无空格。<br /><br /> 6.给所有属性赋一个值<br /><br /> XHTML规定所有属性都必须有一个值，没有值的就重复本身。例如：<br /><br /> <td nowrap> <input type="checkbox" name="shirt" value="medium" checked> <br />必须修改为：<br /><br /> <td nowrap="nowrap"> <input type="checkbox" name="shirt" value="medium" checked="checked"> <br /><br /> 7.不要在注释内容中使“--”<br /><br /> “--”只能发生在XHTML注释的开头和结束，也就是说，在内容中它们不再有效。例如下面的代码是无效的:<br /><br /> <!--这里是注释-----------这里是注释--> <br /> <br /> 用等号或者空格替换内部的虚线。<br /><br /> <!--这里是注释============这里是注释--> <br /><br /> 以上这些规范有的看上去比较奇怪，但这一切都是为了使我们的代码有一个统一、唯一的标准，便于以后的数据再利用。
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以前在HTML中，你可以打开许多标签，例如
2.所有标签的元素和属性的名字都必须使用小写
与HTML不一样，XHTML对大小写是敏感的，