Home Web Front-end HTML Tutorial css reset重置样式有那么重要吗?_html/css_WEB-ITnose

css reset重置样式有那么重要吗?_html/css_WEB-ITnose

Jun 24, 2016 am 11:36 AM

在以前写html代码的时候,一般都会在head里添加重置样式reset.css,其内容如下:

@charset "utf-8";html, body, div, span, applet, object, iframe,h1, h2, h3, h4, h5, h6, p, blockquote, pre,a, abbr, acronym, address, big, cite, code,del, dfn, em, font, img, ins, kbd, q, s, samp,small, strike, strong, sub, sup, tt, var,b, u, i, center,dl, dt, dd, ol, ul, li,fieldset, form, label, legend,table, caption, tbody, tfoot, thead, tr, th, td {    margin: 0;    padding: 0;    border: 0;    outline: 0;    font-size: 100%;    /*background: transparent;*/}table {    border-collapse:collapse;    border-spacing:0;}fieldset, img {    border:0;}address, caption, cite, code, dfn, em, strong, th, var {    font-style:normal;    font-weight:normal;}ol, ul { list-style:none; }caption, th { text-align:left; }h1, h2, h3, h4, h5, h6 {    font-size:200%;    font-weight:normal;}:focus { outline: 0;}a{ text-decoration:none;}a:hover img{ border:none;}a:active{noOutline:expression(this.onFocus=this.blur());}/*清除浮动*/.clearfix:after {    content: ".";    display: block;    height: 0;    clear: both;    visibility: hidden;}.clearfix {display: inline-block;}/* Hides from IE-mac \*/* html .clearfix { height: 1%;}.clearfix {display: block;}/* End hide from IE-mac *//*png css hack for ie6*/*html img.png{    _background-image: expression(this.runtimeStyle.backgroundImage = "none",this.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + this.src + "', sizingMethod='image')",this.src = "http://i0.itc.cn/20101019/848_0a785a7b_1118_4825_85dc_e8696988c94b_0.gif");}
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但是最近在网上看了看网络文章,也感觉有些重置是没有用的。为什么呢?

重置的作用究竟是什么?

CSS reset的作用是让各个浏览器的CSS样式有一个统一的基准,而这个基准更多的就是“清零”!

有时候看到别人网站站的一些重置是这样的:

*{ margin:0; padding:0; }
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这样的写法是极不推荐的。

现在来看重置表发现:

1. 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?答案肯定没有。
2. dt标签有默认的margin与padding值就是0,什么还要使用呢?
3. li标签默认有margin值吗?有padding值吗?没有!
4. code标签是个属于inline水平的元素,居然也扯到margin与padding的重置,没有必要。
5. 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,也没必要。

css真的重置也就那么几个常用的标签而已,你的页面一般都用到什么标签?

body, dl, dd, h1, h2, h3, h4, h5, h6, p, form{margin:0;}  ol,ul{margin:0; padding:0;}
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这样的CSS reset才是高效的,简洁的,其他一些标签都可以去掉的,没有必要。

当然css重置的优点,缺点都不说了,估计心里都非常有数的,还是要根据实际项目来。

后来主管给我推荐了一款替代reset.css重置的替代方案,那就是用Normalize.css。在后面文章里把它的用法等再列出来。

 

作者:风雨后见彩虹

出处:http://www.cnblogs.com/moqiutao/

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