html头文件css的写法：1、通过“”方式引入css；2、使用“”标签，引入外部CSS文件，语法“<link type="text/css" rel="stylesheet" href="css文件的存放地址">”。
本文操作环境：Windows7系统、HTML5&&CSS3、Dell G3电脑。
头文件
元素包含了所有的头部标签元素。
在
元素中你可以插入脚本（scripts），样式文件（CSS），及各种meta信息；可以添加在头部区域的元素标签为:
,<style>,<meta>,<link>,<script>,<noscript>,<base>。</p>
<p><strong>html头文件中css怎么写？</strong></p>
<p>1、内部样式表</p>
<p>内部样式表是将css的样式代码放在html文档<head></head>中的<style></style>标签中，引入css。</p>
<p>在<style>中有一个类型属性type，后面接test/css，表示CSS文本，语法格式如下：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><style type="text/css">
/*这里写CSS内容*/
</style></pre><div class="contentsignin">登录后复制</div></div><p>特点：单个页面内的CSS代码具有统一性和规划性，便于维护，但是在多个页面之间容易混乱</p><p>示例如下：</p><p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/161/115/647/1612664264676699.png" class="lazy" title="1612664264676699.png" alt="ab6651ab309e2fc1271ebfa97208ad2.png"/></p><p>效果图如下：</p><p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/699/321/555/1612664267905532.png" class="lazy" title="1612664267905532.png" alt="b46b4ae982d6384ba51cfc309d94db3.png"/></p><p>2、外部样式表（推荐）</p><p>外部样式表是使用<link>标签，引入外部CSS文件；通常link标签是写在网页的<head></head>之间的。</p><p><link>里面的属性有type、rel、href，其中type固定为text/css，rel（即样式表）固定为stylesheet，href自然指的就是css文件的地址了，语法格式为：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><link type="text/css" rel="stylesheet" href="css文件的存放地址"></pre><div class="contentsignin">登录后复制</div></div><p>示例代码如下：</p>
<p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/332/595/833/1612664272908966.png" class="lazy" title="1612664272908966.png" alt="bed16ab56e2586203807cbfd105af62.png"></p>
<p>web.css内容为</p>
<p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/349/692/183/1612664305394839.png" class="lazy" title="1612664305394839.png" alt="21283e20afee11d06a012e48fb0c871.png"></p>
<p>效果如下</p>
<p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/246/168/936/1612664311440445.png" class="lazy" title="1612664311440445.png" alt="e7e7f50000403eef3657766d8d362e5.png"></p>
<p>推荐：《<a href="https://www.php.cn/course/list/12.html" target="_blank">css视频教程</a>》<br></p><p>以上是html头文件css怎么写的详细内容。更多信息请关注PHP中文网其他相关文章！</p>
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