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你好，CSS！ | Dicerorhinus
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<strong class="toc-title">Table of Contents</strong> <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#概述"><span class="toc-text">概述</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#规则语法"><span class="toc-text">规则语法</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#链接CSS样式表到HTML"><span class="toc-text">链接CSS样式表到HTML</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#度量单位"><span class="toc-text">度量单位</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#选择器"><span class="toc-text">选择器</span></a></li></ol></li></ol>
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<article
id="post-css_1"
class="article article-type-post"
itemprop="blogPost"
>
<header class="article-header">
<h1 class="post-title">你好，CSS！</h1>
<div class="article-meta">
<span>
<i class="icon-calendar"></i>
<span>2018.10.28</span>
</span>
<span class="article-author">
<i class="icon-user"></i>
<span>rhinoc</span>
</span>
<span class="article-category">
<i class="icon-list"></i>
<a class="article-category-link" href="index-97.htm" tppabs="https://rhinoc.top/category/%E5%B5%8C%E5%85%A5%E5%BC%8F/">嵌入式</a>
</span>
</div>
</header>
<div class="article-content">
<h2 id="概述"><a href="#概述" class="headerlink" title="概述"></a>概述</h2><h3 id="规则语法"><a href="#规则语法" class="headerlink" title="规则语法"></a>规则语法</h3><p><img src="15702703457387.png" tppabs="https://pic.rhinoc.top/mweb/15702703457387.png" alt=""></p>
<h3 id="链接CSS样式表到HTML"><a href="#链接CSS样式表到HTML" class="headerlink" title="链接CSS样式表到HTML"></a>链接CSS样式表到HTML</h3><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">'UTF-8'</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">title</span>></span>Hello, CSS<span class="tag"></<span class="name">title</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">link</span> <span class="attr">rel</span>=<span class="string">'stylesheet'</span> <span class="attr">href</span>=<span class="string">'styles.css'</span>/></span></span><br><span class="line"><span class="tag"></<span class="name">head</span>></span></span><br></pre></td></tr></table></figure>
<p><code><link></code>就像是<code><a></code>，但是只用于<code><head></code>内，<code>rel</code>属性定义了link链接的资源与当前HTML文件的关系。</p>
<h3 id="度量单位"><a href="#度量单位" class="headerlink" title="度量单位"></a>度量单位</h3><p>最常见的单位有<code>px</code>和<code>em</code>，前者是<ruby>像素<rt>pixel</rt></ruby>，后者则是一个相对<ruby>基准字体大小<rt>base font size</rt></ruby>的概念。<br><img src="15702710226101.png" tppabs="https://pic.rhinoc.top/mweb/15702710226101.png" alt=""></p>
<h3 id="选择器"><a href="#选择器" class="headerlink" title="选择器"></a>选择器</h3><p><img src="ZIkFlr.svg" tppabs="http://pic.rhinoc.top/ZIkFlr.svg" alt=""></p>
<p><strong>基本选择器</strong></p>
<div class="table-container">
<table>
<thead>
<tr>
<th>选择器</th>
<th>类别</th>
</tr>
</thead>
<tbody>
<tr>
<td>*</td>
<td>通配选择器</td>
</tr>
<tr>
<td>E</td>
<td>元素选择器</td>
</tr>
<tr>
<td>#id</td>
<td>ID选择器</td>
</tr>
<tr>
<td>.class</td>
<td>类选择器</td>
</tr>
<tr>
<td>selector1, selectorN</td>
<td>群组选择器</td>
</tr>
</tbody>
</table>
</div>
<p><strong>层次选择器</strong></p>
<div class="table-container">
<table>
<thead>
<tr>
<th>选择器</th>
<th>类型</th>
</tr>
</thead>
<tbody>
<tr>
<td>E F</td>
<td>后代选择器（选择E下面的所有F）</td>
</tr>
<tr>
<td>E>F</td>
<td>子元素选择器（只选择E下一级的F）</td>
</tr>
<tr>
<td>E+F</td>
<td>相邻兄弟选择器（选择与E同级的第一个F）</td>
</tr>
<tr>
<td>E~F</td>
<td>通用选择器（选择E后与E同级的所有F）</td>
</tr>
</tbody>
</table>
</div>
<p><strong>动态伪类选择器</strong></p>
<div class="table-container">
<table>
<thead>
<tr>
<th>选择器</th>
<th>类型</th>
</tr>
</thead>
<tbody>
<tr>
<td>E:link</td>
<td>链接伪类选择器</td>
</tr>
<tr>
<td>E:visited</td>
<td>链接伪类选择器</td>
</tr>
<tr>
<td>E:active</td>
<td>用户行为伪类选择器</td>
</tr>
<tr>
<td>E:hover</td>
<td>用户行为伪类选择器</td>
</tr>
<tr>
<td>E:focus</td>
<td>用户行为伪类选择器</td>
</tr>
</tbody>
</table>
</div>
<p><strong>目标伪类选择器</strong></p>
<div class="table-container">
<table>
<thead>
<tr>
<th>选择器</th>
<th>类型</th>
</tr>
</thead>
<tbody>
<tr>
<td>E:link</td>
<td>链接伪类选择器</td>
</tr>
<tr>
<td>E:visited</td>
<td>链接伪类选择器</td>
</tr>
<tr>
<td>E:active</td>
<td>用户行为伪类选择器</td>
</tr>
<tr>
<td>E:hover</td>
<td>用户行为伪类选择器</td>
</tr>
<tr>
<td>E:focus</td>
<td>用户行为伪类选择器</td>
</tr>
</tbody>
</table>
</div>
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<p class="post-copyright-author">
<b>本文作者：</b>
<a href="index.html" tppabs="https://rhinoc.top/index.html" target="_blank" title="rhinoc">rhinoc</a>
</p>
<p class="post-copyright-link">
<b>本文链接：</b>
<a href="index-60.htm" tppabs="https://rhinoc.top/css_1/" target="_blank" title="你好，CSS！">https://www.rhinoc.top/css_1/</a></p>
<p class="post-copyright-license">
<b>版权声明：</b>
本博客所有文章除特别声明外，均采用<i class="fa fa-fw fa-creative-commons"></i><a href="javascript:if(confirm(%27https://creativecommons.org/licenses/by-nc-sa/4.0/ \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27https://creativecommons.org/licenses/by-nc-sa/4.0/%27" tppabs="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank" rel="noopener">BY-NC-SA 4.0</a>国际许可协议，转载请注明。</p>
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