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从 normalize.css 分析 CSS Reset
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<h3 id="为什么要进行-CSS-Reset"><a href="#为什么要进行-CSS-Reset" class="headerlink" title="为什么要进行 CSS Reset"></a>为什么要进行 <code>CSS Reset</code></h3><p>目的简单而又粗暴:使CSS样式在各种浏览器下呈现的效果一样。<br><a id="more"></a><br>当年的一个<del>黑魔法</del>:<br><figure class="highlight css"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">* { <span class="attribute">margin</span>: <span class="number">0</span>; <span class="attribute">padding</span>: <span class="number">0</span>; }</div></pre></td></tr></table></figure></p>
<p>这种粗暴的方式曾经给浏览器带来了很大的负荷,它由曾经的红极一时变成现在不受待见。</p>
<p>后来有了一个更加<del>飘逸</del>的<code>CSS Reset</code>代码,它是这样写的:<br><figure class="highlight css"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="selector-tag">body</span>, <span class="selector-tag">div</span>, <span class="selector-tag">dl</span>, <span class="selector-tag">dt</span>, <span class="selector-tag">dd</span>, <span class="selector-tag">ul</span>, <span class="selector-tag">ol</span>, <span class="selector-tag">li</span>, <span class="selector-tag">h1</span>, <span class="selector-tag">h2</span>, <span class="selector-tag">h3</span>, <span class="selector-tag">h4</span>, <span class="selector-tag">h5</span>, <span class="selector-tag">h6</span>, <span class="selector-tag">pre</span>, <span class="selector-tag">code</span>, <span class="selector-tag">form</span>, <span class="selector-tag">fieldset</span>, <span class="selector-tag">legend</span>, <span class="selector-tag">input</span>, <span class="selector-tag">button</span>, <span class="selector-tag">textarea</span>, <span class="selector-tag">p</span>, <span class="selector-tag">blockquote</span>, <span class="selector-tag">th</span>, <span class="selector-tag">td</span> { <span class="attribute">margin</span>: <span class="number">0</span>;<span class="attribute">padding</span>: <span class="number">0</span>; }</div></pre></td></tr></table></figure></p>
<p>更有甚者,将前面一堆CSS选择器换成了几乎所有HTML标签,与上一个黑魔法并无二致。</p>
<p>这里引用一下<a href="http://www.zhangxinxu.com/wordpress/2010/04/css-reset%e7%9a%84%e9%87%8d%e6%96%b0%e5%ae%a1%e8%a7%86-%e9%81%bf%e5%85%8d%e6%a0%b7%e5%bc%8f%e9%87%8d%e7%bd%ae/" target="_blank" rel="external">张鑫旭</a>的吐槽:</p>
<blockquote>
<ol>
<li>div标签默认有margin值吗?有padding值吗?怎么会想到应用div{margin:0; padding:0;}属性呢?真是画蛇添足,多此一举。</li><li>dt标签有默认的margin与padding值就是0,这里为什么还要使用呢?</li><li>li标签默认有margin值吗?有padding值吗?压根就没有,也不自己测测,还没事找事设置个li{margin:0; padding:0;}属性,真是衰!</li><li>code标签是个属于inline水平的元素,居然也扯到margin与padding的重置,真是好笑。</li><li>还有,像form, input, button, textarea这样子的表单元素,有margin值吗?有padding值吗?我真是不解!</li><li>fieldset, legend这两个90年代的标签你的网站上使用了吗?使用概率不足1%的标签也拿来重置,我实在无语了。</li><li>还有th,td这些标签,幸好没有写上table与tr标签,否则我一起痛批一段。</li></ol>
</blockquote>
<hr>
<h3 id="normalize-css是什么?"><a href="#normalize-css是什么?" class="headerlink" title="normalize.css是什么?"></a>normalize.css是什么?</h3><p><a href="https://github.com/necolas/normalize.css" target="_blank" rel="external">normalize.css</a>是一个<code>CSS Reset</code>项目,由<a href="https://github.com/necolas" target="_blank" rel="external">necolas</a>发起并维护。</p>
<p>以下部分文字为<code>normalize.css</code>官网的介绍:</p>
<blockquote>
<p><strong>A modern, HTML5-ready alternative to CSS resets</strong></p>
<p>Normalize.css makes browsers render all elements more consistently and in line with modern standards. It precisely targets only the styles that need normalizing.</p>
</blockquote>
<p><a href="https://www.zhihu.com/question/20094066" target="_blank" rel="external">知乎</a>上有一段针对normalize.css 的评价:</p>
<blockquote>
<p>Normalize 相对「平和」,注重通用的方案,重置掉该重置的样式,保留有用的 user agent 样式,同时进行一些 bug 的修复,这点是 reset 所缺乏的。</p>
</blockquote>
<h3 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h3><ul>
<li><a href="http://necolas.github.io/normalize.css/" target="_blank" rel="external">Normalize.css</a></li><li><a href="http://nicolasgallagher.com/about-normalize-css/" target="_blank" rel="external">About normalize.css</a></li><li><a href="http://jerryzou.com/posts/aboutNormalizeCss/" target="_blank" rel="external">来,让我们谈一谈 Normalize.css</a></li><li><a href="http://stackoverflow.com/questions/6887336/what-is-the-difference-between-normalize-css-and-reset-css" target="_blank" rel="external">What is the difference between Normalize.css and Reset CSS?</a></li><li><a href="https://www.zhihu.com/question/20094066" target="_blank" rel="external">Normalize.css 与传统的 CSS Reset 有哪些区别?</a></li><li><a href="https://html.spec.whatwg.org/multipage/rendering.html#the-css-user-agent-style-sheet-and-presentational-hints" target="_blank" rel="external">The CSS user agent style sheet and presentational hints</a></li><li><a href="http://www.zhangxinxu.com/wordpress/2010/04/css-reset%e7%9a%84%e9%87%8d%e6%96%b0%e5%ae%a1%e8%a7%86-%e9%81%bf%e5%85%8d%e6%a0%b7%e5%bc%8f%e9%87%8d%e7%bd%ae/" target="_blank" rel="external">CSS reset的重新审视 – 避免样式重置</a></li><li><a href="http://www.cnblogs.com/yizuierguo/archive/2009/07/15/1524106.html" target="_blank" rel="external">Reset CSS:只选对的,不选”贵”的</a></li><li><a href="http://nec.netease.com/" target="_blank" rel="external">NEC : 更好的CSS样式解决方案</a></li></ul>
<hr>
<h3 id="normalize-css-v4-1-1-源码"><a href="#normalize-css-v4-1-1-源码" class="headerlink" title="normalize.css v4.1.1 源码"></a><code>normalize.css v4.1.1</code> 源码</h3><figure class="highlight css"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div 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class="line">402</div><div class="line">403</div><div class="line">404</div><div class="line">405</div><div class="line">406</div><div class="line">407</div><div class="line">408</div><div class="line">409</div><div class="line">410</div><div class="line">411</div><div class="line">412</div><div class="line">413</div><div class="line">414</div><div class="line">415</div><div class="line">416</div><div class="line">417</div><div class="line">418</div><div class="line">419</div><div class="line">420</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/*! normalize.css v4.1.1 | MIT License | github.com/necolas/normalize.css */</span></div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Change the default font family in all browsers (opinionated).</div><div class="line"> * 2. Prevent adjustments of font size after orientation changes in IE and iOS.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">html</span> {</div><div class="line"> <span class="attribute">font-family</span>: sans-serif; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">-ms-text-size-adjust</span>: <span class="number">100%</span>; <span class="comment">/* 2 */</span></div><div class="line"> <span class="attribute">-webkit-text-size-adjust</span>: <span class="number">100%</span>; <span class="comment">/* 2 */</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Remove the margin in all browsers (opinionated).</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">body</span> {</div><div class="line"> <span class="attribute">margin</span>: <span class="number">0</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/* HTML5 display definitions</span></div><div class="line"> ========================================================================== */</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Add the correct display in IE 9-.</div><div class="line"> * 1. Add the correct display in Edge, IE, and Firefox.</div><div class="line"> * 2. Add the correct display in IE.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">article</span>,</div><div class="line"><span class="selector-tag">aside</span>,</div><div class="line"><span class="selector-tag">details</span>, <span class="comment">/* 1 */</span></div><div class="line"><span class="selector-tag">figcaption</span>,</div><div class="line"><span class="selector-tag">figure</span>,</div><div class="line"><span class="selector-tag">footer</span>,</div><div class="line"><span class="selector-tag">header</span>,</div><div class="line"><span class="selector-tag">main</span>, <span class="comment">/* 2 */</span></div><div class="line"><span class="selector-tag">menu</span>,</div><div class="line"><span class="selector-tag">nav</span>,</div><div class="line"><span class="selector-tag">section</span>,</div><div class="line"><span class="selector-tag">summary</span> { <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">display</span>: block;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Add the correct display in IE 9-.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">audio</span>,</div><div class="line"><span class="selector-tag">canvas</span>,</div><div class="line"><span class="selector-tag">progress</span>,</div><div class="line"><span class="selector-tag">video</span> {</div><div class="line"> <span class="attribute">display</span>: inline-block;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Add the correct display in iOS 4-7.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">audio</span><span class="selector-pseudo">:not(</span><span class="selector-attr">[controls]</span>) {</div><div class="line"> <span class="attribute">display</span>: none;</div><div class="line"> <span class="attribute">height</span>: <span class="number">0</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Add the correct vertical alignment in Chrome, Firefox, and Opera.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">progress</span> {</div><div class="line"> <span class="attribute">vertical-align</span>: baseline;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Add the correct display in IE 10-.</div><div class="line"> * 1. Add the correct display in IE.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">template</span>, <span class="comment">/* 1 */</span></div><div class="line"><span class="selector-attr">[hidden]</span> {</div><div class="line"> <span class="attribute">display</span>: none;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/* Links</span></div><div class="line"> ========================================================================== */</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Remove the gray background on active links in IE 10.</div><div class="line"> * 2. Remove gaps in links underline in iOS 8+ and Safari 8+.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">a</span> {</div><div class="line"> <span class="attribute">background-color</span>: transparent; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">-webkit-text-decoration-skip</span>: objects; <span class="comment">/* 2 */</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Remove the outline on focused links when they are also active or hovered</div><div class="line"> * in all browsers (opinionated).</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">a</span><span class="selector-pseudo">:active</span>,</div><div class="line"><span class="selector-tag">a</span><span class="selector-pseudo">:hover</span> {</div><div class="line"> <span class="attribute">outline-width</span>: <span class="number">0</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/* Text-level semantics</span></div><div class="line"> ========================================================================== */</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Remove the bottom border in Firefox 39-.</div><div class="line"> * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">abbr</span><span class="selector-attr">[title]</span> {</div><div class="line"> <span class="attribute">border-bottom</span>: none; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">text-decoration</span>: underline; <span class="comment">/* 2 */</span></div><div class="line"> <span class="attribute">text-decoration</span>: underline dotted; <span class="comment">/* 2 */</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Prevent the duplicate application of `bolder` by the next rule in Safari 6.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">b</span>,</div><div class="line"><span class="selector-tag">strong</span> {</div><div class="line"> <span class="attribute">font-weight</span>: inherit;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Add the correct font weight in Chrome, Edge, and Safari.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">b</span>,</div><div class="line"><span class="selector-tag">strong</span> {</div><div class="line"> <span class="attribute">font-weight</span>: bolder;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Add the correct font style in Android 4.3-.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">dfn</span> {</div><div class="line"> <span class="attribute">font-style</span>: italic;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Correct the font size and margin on `h1` elements within `section` and</div><div class="line"> * `article` contexts in Chrome, Firefox, and Safari.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">h1</span> {</div><div class="line"> <span class="attribute">font-size</span>: <span class="number">2em</span>;</div><div class="line"> <span class="attribute">margin</span>: <span class="number">0.67em</span> <span class="number">0</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Add the correct background and color in IE 9-.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">mark</span> {</div><div class="line"> <span class="attribute">background-color</span>: <span class="number">#ff0</span>;</div><div class="line"> <span class="attribute">color</span>: <span class="number">#000</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Add the correct font size in all browsers.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">small</span> {</div><div class="line"> <span class="attribute">font-size</span>: <span class="number">80%</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Prevent `sub` and `sup` elements from affecting the line height in</div><div class="line"> * all browsers.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">sub</span>,</div><div class="line"><span class="selector-tag">sup</span> {</div><div class="line"> <span class="attribute">font-size</span>: <span class="number">75%</span>;</div><div class="line"> <span class="attribute">line-height</span>: <span class="number">0</span>;</div><div class="line"> <span class="attribute">position</span>: relative;</div><div class="line"> <span class="attribute">vertical-align</span>: baseline;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="selector-tag">sub</span> {</div><div class="line"> <span class="attribute">bottom</span>: -<span class="number">0.25em</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="selector-tag">sup</span> {</div><div class="line"> <span class="attribute">top</span>: -<span class="number">0.5em</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/* Embedded content</span></div><div class="line"> ========================================================================== */</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Remove the border on images inside links in IE 10-.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">img</span> {</div><div class="line"> <span class="attribute">border-style</span>: none;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Hide the overflow in IE.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">svg</span><span class="selector-pseudo">:not(</span><span class="selector-pseudo">:root)</span> {</div><div class="line"> <span class="attribute">overflow</span>: hidden;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/* Grouping content</span></div><div class="line"> ========================================================================== */</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Correct the inheritance and scaling of font size in all browsers.</div><div class="line"> * 2. Correct the odd `em` font sizing in all browsers.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">code</span>,</div><div class="line"><span class="selector-tag">kbd</span>,</div><div class="line"><span class="selector-tag">pre</span>,</div><div class="line"><span class="selector-tag">samp</span> {</div><div class="line"> <span class="attribute">font-family</span>: monospace, monospace; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">font-size</span>: <span class="number">1em</span>; <span class="comment">/* 2 */</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Add the correct margin in IE 8.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">figure</span> {</div><div class="line"> <span class="attribute">margin</span>: <span class="number">1em</span> <span class="number">40px</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Add the correct box sizing in Firefox.</div><div class="line"> * 2. Show the overflow in Edge and IE.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">hr</span> {</div><div class="line"> <span class="attribute">box-sizing</span>: content-box; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">height</span>: <span class="number">0</span>; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">overflow</span>: visible; <span class="comment">/* 2 */</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/* Forms</span></div><div class="line"> ========================================================================== */</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Change font properties to `inherit` in all browsers (opinionated).</div><div class="line"> * 2. Remove the margin in Firefox and Safari.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">button</span>,</div><div class="line"><span class="selector-tag">input</span>,</div><div class="line"><span class="selector-tag">optgroup</span>,</div><div class="line"><span class="selector-tag">select</span>,</div><div class="line"><span class="selector-tag">textarea</span> {</div><div class="line"> <span class="attribute">font</span>: inherit; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">margin</span>: <span class="number">0</span>; <span class="comment">/* 2 */</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Restore the font weight unset by the previous rule.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">optgroup</span> {</div><div class="line"> <span class="attribute">font-weight</span>: bold;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Show the overflow in IE.</div><div class="line"> * 1. Show the overflow in Edge.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">button</span>,</div><div class="line"><span class="selector-tag">input</span> { <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">overflow</span>: visible;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Remove the inheritance of text transform in Edge, Firefox, and IE.</div><div class="line"> * 1. Remove the inheritance of text transform in Firefox.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">button</span>,</div><div class="line"><span class="selector-tag">select</span> { <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">text-transform</span>: none;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`</div><div class="line"> * controls in Android 4.</div><div class="line"> * 2. Correct the inability to style clickable types in iOS and Safari.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">button</span>,</div><div class="line"><span class="selector-tag">html</span> <span class="selector-attr">[type="button"]</span>, <span class="comment">/* 1 */</span></div><div class="line"><span class="selector-attr">[type="reset"]</span>,</div><div class="line"><span class="selector-attr">[type="submit"]</span> {</div><div class="line"> <span class="attribute">-webkit-appearance</span>: button; <span class="comment">/* 2 */</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Remove the inner border and padding in Firefox.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">button</span><span class="selector-pseudo">::-moz-focus-inner</span>,</div><div class="line"><span class="selector-attr">[type="button"]</span><span class="selector-pseudo">::-moz-focus-inner</span>,</div><div class="line"><span class="selector-attr">[type="reset"]</span><span class="selector-pseudo">::-moz-focus-inner</span>,</div><div class="line"><span class="selector-attr">[type="submit"]</span><span class="selector-pseudo">::-moz-focus-inner</span> {</div><div class="line"> <span class="attribute">border-style</span>: none;</div><div class="line"> <span class="attribute">padding</span>: <span class="number">0</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Restore the focus styles unset by the previous rule.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">button</span><span class="selector-pseudo">:-moz-focusring</span>,</div><div class="line"><span class="selector-attr">[type="button"]</span><span class="selector-pseudo">:-moz-focusring</span>,</div><div class="line"><span class="selector-attr">[type="reset"]</span><span class="selector-pseudo">:-moz-focusring</span>,</div><div class="line"><span class="selector-attr">[type="submit"]</span><span class="selector-pseudo">:-moz-focusring</span> {</div><div class="line"> <span class="attribute">outline</span>: <span class="number">1px</span> dotted ButtonText;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Change the border, margin, and padding in all browsers (opinionated).</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">fieldset</span> {</div><div class="line"> <span class="attribute">border</span>: <span class="number">1px</span> solid <span class="number">#c0c0c0</span>;</div><div class="line"> <span class="attribute">margin</span>: <span class="number">0</span> <span class="number">2px</span>;</div><div class="line"> <span class="attribute">padding</span>: <span class="number">0.35em</span> <span class="number">0.625em</span> <span class="number">0.75em</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Correct the text wrapping in Edge and IE.</div><div class="line"> * 2. Correct the color inheritance from `fieldset` elements in IE.</div><div class="line"> * 3. Remove the padding so developers are not caught out when they zero out</div><div class="line"> * `fieldset` elements in all browsers.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">legend</span> {</div><div class="line"> <span class="attribute">box-sizing</span>: border-box; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">color</span>: inherit; <span class="comment">/* 2 */</span></div><div class="line"> <span class="attribute">display</span>: table; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">max-width</span>: <span class="number">100%</span>; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">padding</span>: <span class="number">0</span>; <span class="comment">/* 3 */</span></div><div class="line"> <span class="attribute">white-space</span>: normal; <span class="comment">/* 1 */</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Remove the default vertical scrollbar in IE.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-tag">textarea</span> {</div><div class="line"> <span class="attribute">overflow</span>: auto;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Add the correct box sizing in IE 10-.</div><div class="line"> * 2. Remove the padding in IE 10-.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-attr">[type="checkbox"]</span>,</div><div class="line"><span class="selector-attr">[type="radio"]</span> {</div><div class="line"> <span class="attribute">box-sizing</span>: border-box; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">padding</span>: <span class="number">0</span>; <span class="comment">/* 2 */</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Correct the cursor style of increment and decrement buttons in Chrome.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-attr">[type="number"]</span><span class="selector-pseudo">::-webkit-inner-spin-button</span>,</div><div class="line"><span class="selector-attr">[type="number"]</span><span class="selector-pseudo">::-webkit-outer-spin-button</span> {</div><div class="line"> <span class="attribute">height</span>: auto;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Correct the odd appearance in Chrome and Safari.</div><div class="line"> * 2. Correct the outline style in Safari.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-attr">[type="search"]</span> {</div><div class="line"> <span class="attribute">-webkit-appearance</span>: textfield; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">outline-offset</span>: -<span class="number">2px</span>; <span class="comment">/* 2 */</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Remove the inner padding and cancel buttons in Chrome and Safari on OS X.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-attr">[type="search"]</span><span class="selector-pseudo">::-webkit-search-cancel-button</span>,</div><div class="line"><span class="selector-attr">[type="search"]</span><span class="selector-pseudo">::-webkit-search-decoration</span> {</div><div class="line"> <span class="attribute">-webkit-appearance</span>: none;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * Correct the text style of placeholders in Chrome, Edge, and Safari.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-pseudo">::-webkit-input-placeholder</span> {</div><div class="line"> <span class="attribute">color</span>: inherit;</div><div class="line"> <span class="attribute">opacity</span>: <span class="number">0.54</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 1. Correct the inability to style clickable types in iOS and Safari.</div><div class="line"> * 2. Change font properties to `inherit` in Safari.</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="selector-pseudo">::-webkit-file-upload-button</span> {</div><div class="line"> <span class="attribute">-webkit-appearance</span>: button; <span class="comment">/* 1 */</span></div><div class="line"> <span class="attribute">font</span>: inherit; <span class="comment">/* 2 */</span></div><div class="line">}</div></pre></td></tr></table></figure>
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