标题标签
html的标题标签从h1~h6共六个级别，权值不断降低，即不断变小,不用使用CSS控制来取代h标签，因为网页搜索引擎通过搜索到你的页面，找到你页面的h标签并为h标签建立索引，如果h标签被替代，不利于网站的SEO优化，代码演示为
1 <html> 2 <head> 3 <title>显示标题</title> 4 <script type="text/css"> 5 <!--添加页面控制脚本 --> 6 </script> 7 <script type="text/javascript"> 8 <!--添加js脚本 --> 9 </script>10 </head>11 <body >12 <h1 id="一级标题">一级标题</h1>13 <h2 id="二级标题">二级标题</h2>14 <h3 id="三级标题">三级标题</h3>15 <h4 id="四级标题">四级标题</h4>16 <h5 id="五级标题">五级标题</h5>17 <h6 id="六级标题">六级标题</h6> 18 </body>19 </html>
运行后：
物理字体
实际开发中，物理字体标签多被css所取代，一般只使用b标签和i便签，而且多用于图片的处理
1 <html> 2 <head> 3 <title></title> 4 </head> 5 <body > 6 <b>粗体(bold)</b>正常的</br> 7 <i>意大利斜体(Italic)</i>正常的</br> 8 <tt>打印机字体</tt>正常的</br> 9 <u>下划线(underline)</u>正常的</br>10 <!--sup为上标 ，sub为下标-->11 2<sup>上标</sup>3<sub>下标</sub></br>12 <s>删除线</s>13 </body>14 </html>
运行后：
逻辑字体和客户端字体
常用的逻辑字体标签有定义代码段文本的标签和定义<strong>引用</strong>的<cite>便签。</cite>
客户端字体一般存放在电脑的C:\Windows\Fonts中，常用的客户端字体标签是font标签，一般被css取代（因其大小的局限性），常用的属性有size大小（值从1-7逐渐变大，或+x,即在当前size的基础上（默认为3）加上x）,color颜色和face字体
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