HTML - XHTML

XHTML 是以 XML 格式编写的 HTML。

什么是 XHTML?

XHTML 指的是可扩展超文本标记语言
XHTML 与 HTML 4.01 几乎是相同的
XHTML 是更严格更纯净的 HTML 版本
XHTML 是以 XML 应用的方式定义的 HTML
XHTML 是 2001 年 1 月发布的 W3C 推荐标准
XHTML 得到所有主流浏览器的支持

为什么使用 XHTML?

因特网上的很多页面包含了"糟糕"的 HTML。

如果在浏览器中查看，下面的 HTML 代码运行起来非常正常（即使它并未遵守 HTML 规则）：

<html> <head> <meta charset="utf-8"> <title>这是一个不规范的 HTMLtitle> <body> <h1>不规范的 HTML <p>这是一个段落 body>

XML 是一种必须正确标记且格式良好的标记语言。

如果希望学习 XML，请阅读我们的 XML 教程。

今日的科技界存在一些不同的浏览器技术。其中一些在计算机上运行，而另一些可能在移动电话或其他小型设备上运行。小型设备往往缺乏解释"糟糕"的标记语言的资源和能力。

所以 - 通过结合 XML 和 HTML 的长处，开发出了 XHTML。XHTML 是作为 XML 被重新设计的 HTML。

与 HTML 相比最重要的区别：

文档结构

XHTML DOCTYPE 是强制性的
中的 XML namespace 属性是强制性的
、、以及 <body> 也是<em>强制性的</em></li> </ul> <h3>元素语法</h3> <ul> <li>XHTML 元素必须<em>正确嵌套</em></li> <li>XHTML 元素必须始终<em>关闭</em></li> <li>XHTML 元素必须<em>小写</em></li> <li>XHTML 文档必须有<em>一个根元素</em></li> </ul> <h3>属性语法</h3> <ul> <li>XHTML 属性必须使用<em>小写</em></li> <li>XHTML 属性值必须用<em>引号包围</em></li> <li>XHTML 属性最小化也是<em>禁止的</em></li> </ul><hr> <h2><!DOCTYPE ....>是强制性的</h2> <p>XHTML 文档必须进行 XHTML 文档类型声明（XHTML DOCTYPE declaration）。</p> <p>您可以在菜鸟教程的标签参考手册中找到完整的 <a href="/tags/tag-doctype.html">XHTML 文档类型。</a></p> <p><html>, <head>, <title>, 和 <body> 元素也必须存在，并且必须使用 <html> 中的 xmlns 属性为文档规定 xml 命名空间。</p> <p>下面的例子展示了带有最少的必需标签的 XHTML 文档：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-code">!</span><span class="hl-var">DOCTYPE</span><span class="hl-code"> </span><span class="hl-var">html</span><span class="hl-code"> </span><span class="hl-var">PUBLIC</span><span class="hl-code"> </span><span class="hl-quotes">"</span><span class="hl-string">-//W3C//DTD XHTML 1.0 Transitional//EN</span><span class="hl-quotes">"</span><span class="hl-code"> </span><span class="hl-quotes">"</span><span class="hl-string">http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd</span><span class="hl-quotes">"</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">html</span><span class="hl-code"> </span><span class="hl-var">xmlns</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">http://www.w3.org/1999/xhtml</span><span class="hl-quotes">"</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">head</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">meta</span><span class="hl-code"> </span><span class="hl-var">charset</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">utf-8</span><span class="hl-quotes">"</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">title</span><span class="hl-brackets">></span><span class="hl-code">文档标题</span><span class="hl-brackets"></</span><span class="hl-reserved">title</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"></</span><span class="hl-reserved">head</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">body</span><span class="hl-brackets">></span><span class="hl-code"> 文档内容 </span><span class="hl-brackets"></</span><span class="hl-reserved">body</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"></</span><span class="hl-reserved">html</span><span class="hl-brackets">></span></div> </div> </div> <br><hr> <h2>XHTML 元素必须合理嵌套</h2> <p>在 HTML 中，一些元素可以不互相嵌套，像这样：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">b</span><span class="hl-brackets">></span><span class="hl-brackets"><</span><span class="hl-reserved">i</span><span class="hl-brackets">></span><span class="hl-code">粗体和斜体文本</span><span class="hl-brackets"></</span><span class="hl-reserved">b</span><span class="hl-brackets">></span><span class="hl-brackets"></</span><span class="hl-reserved">i</span><span class="hl-brackets">></span></div> </div> </div> <p>在 XHTML 中，所有的元素都必须互相合理地嵌套，像这样：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">b</span><span class="hl-brackets">></span><span class="hl-brackets"><</span><span class="hl-reserved">i</span><span class="hl-brackets">></span><span class="hl-code">粗体和斜体文本</span><span class="hl-brackets"></</span><span class="hl-reserved">i</span><span class="hl-brackets">></span><span class="hl-brackets"></</span><span class="hl-reserved">b</span><span class="hl-brackets">></span></div> </div> </div> <br><hr> <h2>XHTML 元素必须有关闭标签</h2> <p>错误示例：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">p</span><span class="hl-brackets">></span><span class="hl-code">这是一个段落 </span><span class="hl-brackets"><</span><span class="hl-reserved">p</span><span class="hl-brackets">></span><span class="hl-code">这是另外一个段落</span></div> </div> </div> <p>正确示例：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">p</span><span class="hl-brackets">></span><span class="hl-code">这是一个段落</span><span class="hl-brackets"></</span><span class="hl-reserved">p</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">p</span><span class="hl-brackets">></span><span class="hl-code">这是另外一个段落</span><span class="hl-brackets"></</span><span class="hl-reserved">p</span><span class="hl-brackets">></span></div> </div> </div> <br><hr> <h2>空元素必须包含关闭标签</h2> <p>错误示例：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-code">分行:</span><span class="hl-brackets"><</span><span class="hl-reserved">br</span><span class="hl-brackets">></span><span class="hl-code"> 水平线: </span><span class="hl-brackets"><</span><span class="hl-reserved">hr</span><span class="hl-brackets">></span><span class="hl-code"> 图片: </span><span class="hl-brackets"><</span><span class="hl-reserved">img</span><span class="hl-code"> </span><span class="hl-var">src</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">happy.gif</span><span class="hl-quotes">"</span><span class="hl-code"> </span><span class="hl-var">alt</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">Happy face</span><span class="hl-quotes">"</span><span class="hl-brackets">></span></div> </div> </div> <p>正确示例：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-code">分行:</span><span class="hl-brackets"><</span><span class="hl-reserved">br</span><span class="hl-code"> </span><span class="hl-brackets">/></span><span class="hl-code"> 水平线: </span><span class="hl-brackets"><</span><span class="hl-reserved">hr</span><span class="hl-code"> </span><span class="hl-brackets">/></span><span class="hl-code"> 图片: </span><span class="hl-brackets"><</span><span class="hl-reserved">img</span><span class="hl-code"> </span><span class="hl-var">src</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">happy.gif</span><span class="hl-quotes">"</span><span class="hl-code"> </span><span class="hl-var">alt</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">Happy face</span><span class="hl-quotes">"</span><span class="hl-code"> </span><span class="hl-brackets">/></span></div> </div> </div> <br><hr> <h2>XHTML 元素必须是小写</h2> <p>错误示例:</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">BODY</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">P</span><span class="hl-brackets">></span><span class="hl-code">这是一个段落</span><span class="hl-brackets"></</span><span class="hl-reserved">P</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"></</span><span class="hl-reserved">BODY</span><span class="hl-brackets">></span></div> </div> </div> <p>正确示例：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">body</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">p</span><span class="hl-brackets">></span><span class="hl-code">这是一个段落</span><span class="hl-brackets"></</span><span class="hl-reserved">p</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"></</span><span class="hl-reserved">body</span><span class="hl-brackets">></span></div> </div> </div> <br><hr> <h2>属性名称必须是小写</h2> <p>错误示例：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">table</span><span class="hl-code"> </span><span class="hl-var">WIDTH</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">100%</span><span class="hl-quotes">"</span><span class="hl-brackets">></span></div> </div> </div> <p>正确示例:</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">table</span><span class="hl-code"> </span><span class="hl-var">width</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">100%</span><span class="hl-quotes">"</span><span class="hl-brackets">></span></div> </div> </div> <br><hr> <h2>属性值必须有引号</h2> <p>错误示例：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">table</span><span class="hl-code"> </span><span class="hl-var">width</span><span class="hl-code">=</span><span class="hl-var">100</span><span class="hl-code">%</span><span class="hl-brackets">></span></div> </div> </div> <p>正确示例：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">table</span><span class="hl-code"> </span><span class="hl-var">width</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">100%</span><span class="hl-quotes">"</span><span class="hl-brackets">></span></div> </div> </div> <br><hr> <h2>不允许属性简写</h2> <p>错误示例：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">input</span><span class="hl-code"> </span><span class="hl-var">checked</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">input</span><span class="hl-code"> </span><span class="hl-var">readonly</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">input</span><span class="hl-code"> </span><span class="hl-var">disabled</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">option</span><span class="hl-code"> </span><span class="hl-var">selected</span><span class="hl-brackets">></span></div> </div> </div> <p>正确示例：</p> <div class="example"> <div class="example_code"> <div class="hl-main"><span class="hl-brackets"><</span><span class="hl-reserved">input</span><span class="hl-code"> </span><span class="hl-var">checked</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">checked</span><span class="hl-quotes">"</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">input</span><span class="hl-code"> </span><span class="hl-var">readonly</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">readonly</span><span class="hl-quotes">"</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">input</span><span class="hl-code"> </span><span class="hl-var">disabled</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">disabled</span><span class="hl-quotes">"</span><span class="hl-brackets">></span><span class="hl-code"> </span><span class="hl-brackets"><</span><span class="hl-reserved">option</span><span class="hl-code"> </span><span class="hl-var">selected</span><span class="hl-code">=</span><span class="hl-quotes">"</span><span class="hl-string">selected</span><span class="hl-quotes">"</span><span class="hl-brackets">></span></div> </div> </div> <br><hr> <h2>如何将 HTML 转换为 XHTML</h2> <ol> <li>添加一个 XHTML <!DOCTYPE> 到你的网页中</li> <li>添加 xmlns 属性添加到每个页面的html元素中。 </li> <li>改变所有的元素为小写</li> <li>关闭所有的空元素</li> <li>修改所有的属性名称为小写</li> <li>所有属性值添加引号</li> </ol> <hr> <h2>使用 W3C 验证器来测试你的 XHTML</h2> <form method="get" action="https://validator.w3.org/check" target="_blank"> <p>请在下面的输入框中输入您的网址：</p> <p><input name="uri" size="60" value="https://www.runoob.com"/></p> <input type="submit" value="页面验证"></form> </form>  </div> </div> </div> <div class="cate_right"> <script 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