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标题1标签在不同浏览器的盒子模型
Home Web Front-end Front-end Q&A What is the name of initialization css?

What is the name of initialization css?

Aug 29, 2022 pm 06:41 PM
css

初始化css又叫“CSS reset”,是指重新设置浏览器默认样式。初始化原因:1、浏览器有兼容性问题,不同浏览器对有些标签的默认值是不同的,如果没对CSS初始化往往会出现浏览器之间的页面显示差异。2、初始化CSS可以节约网页代码,节约网页下载时间;还会使得网页内容时更加方便简洁;提高编码质量。

What is the name of initialization css?

本教程操作环境:windows7系统、CSS3&&HTML5版、Dell G3电脑。

CSS 初始化是指重新设置浏览器默认样式(也称为 CSS reset )。每个网页都必须进行 CSS 初始化,才能保证浏览器的兼容性。

初始化CSS的原因

1、浏览器差异

因为浏览器的兼容问题,不同浏览器对有些标签的默认值是不同的,如果没对CSS初始化往往会出现浏览器之间的页面显示差异。

<h1 id="标题-标签在不同浏览器的盒子模型">标题1标签在不同浏览器的盒子模型</h1>
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What is the name of initialization css?

从上面可以看出,同一个标签,不同的浏览器解析的数据是不一样的,这样就会导致显示的差异了。

2、提高编码质量

初始化CSS为我们节约网页代码,节约网页下载时间;还会使得我们开发网页内容时更加方便简洁,不用考虑很多。

如果不初始化,整个页面做完会很糟糕,重复的css样式很多。我们在开发比较复杂的网页时候就不会知道自己是否已经设置了此处的CSS属性,是否和前面的CSS属性相同,是否统一整个网页的风格和样式。

每次新开发网站或新网页时候通过初始化CSS样式的属性,为我们将用到的CSS或html标签更加方便准确,使得我们开发网页内容时更加方便简洁,同时减少CSS代码量,节约网页下载时间。

弊端

初始化样式会对SEO有一定的影响,但鱼和熊掌不可兼得,但力求影响最小的情况下初始化。

怎么初始化CSS?

最简单的初始化方法就是:

* {padding: 0; margin: 0;}
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有很多人也是这样写的。这确实很简单,但有人就会感到疑问:*号这样一个通用符在编写代码的时候是快,但如果网站很大,CSS样式表文件很大,这样写的话,他会把所有的标签都初始化一遍,这样就大大的加强了网站运行的负载,会使网站加载的时候需要很长一段时间。

淘宝样式初始化:

body, h1, h2, h3, h4, h5, h6, hr, p, blockquote, dl, dt, dd, ul, ol, li, pre, 
form, fieldset, legend, button, input, textarea, th, td { margin:0; padding:0; }body, button, input, select, textarea { font:12px/1.5tahoma, arial, \5b8b\4f53; }h1, h2, h3, h4, h5, h6{ font-size:100%; }address, cite, dfn, em, var { font-style:normal; }code, kbd, pre, samp { font-family:couriernew, courier, monospace; }small{ font-size:12px; }ul, ol { list-style:none; }a { text-decoration:none; }a:hover { text-decoration:underline; }sup { vertical-align:text-top; }sub{ vertical-align:text-bottom; }legend { color:#000; }fieldset, img { border:0; }button, input, select, textarea { font-size:100%; }table { border-collapse:collapse; border-spacing:0; }
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腾讯QQ官网 样式初始化

body,ol,ul,h1,h2,h3,h4,h5,h6,p,th,td,dl,dd,form,fieldset,legend,input,textarea,select{margin:0;padding:0} 
body{font:12px"宋体","Arial Narrow",HELVETICA;background:#fff;-webkit-text-size-adjust:100%;} 
a{color:#2d374b;text-decoration:none} 
a:hover{color:#cd0200;text-decoration:underline} 
em{font-style:normal} 
li{list-style:none} 
img{border:0;vertical-align:middle} 
table{border-collapse:collapse;border-spacing:0} 
p{word-wrap:break-word}
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新浪官网 样式初始化

body,ul,ol,li,p,h1,h2,h3,h4,h5,h6,form,fieldset,table,td,img,div{margin:0;padding:0;border:0;} 
body{background:#fff;color:#333;font-size:12px; margin-top:5px;font-family:"SimSun","宋体","Arial Narrow";} 
 
ul,ol{list-style-type:none;} 
select,input,img,select{vertical-align:middle;} 
 
a{text-decoration:none;} 
a:link{color:#009;} 
a:visited{color:#800080;} 
a:hover,a:active,a:focus{color:#c00;text-decoration:underline;}
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京东CSS初始化代码

/* 把我们所有标签的内外边距清零 */
* {
    margin: 0;
    padding: 0
}
/* em 和 i 斜体的文字不倾斜 */
em,
i {
    font-style: normal
}
/* 去掉li 的小圆点 */
li {
    list-style: none
}

img {
    /* border 0 照顾低版本浏览器 如果 图片外面包含了链接会有边框的问题 */
    border: 0;
    /* 取消图片底侧有空白缝隙的问题 */
    vertical-align: middle
}

button {
    /* 当我们鼠标经过button 按钮的时候,鼠标变成小手 */
    cursor: pointer
}
   /* 改变a链接的默认样式,颜色和下划线 */
a {
    color: #666;
    text-decoration: none
}

a:hover {
    color: #c81623
}

button,
input {
    /* "\5B8B\4F53" 就是宋体的意思 这样浏览器兼容性比较好 */
    font-family: Microsoft YaHei, Heiti SC, tahoma, arial, Hiragino Sans GB, "\5B8B\4F53", sans-serif
}

body {
    /* CSS3 抗锯齿形 让文字显示的更加清晰 */
    -webkit-font-smoothing: antialiased;
    background-color: #fff;
    font: 12px/1.5 Microsoft YaHei, Heiti SC, tahoma, arial, Hiragino Sans GB, "\5B8B\4F53", sans-serif;
    color: #666
}

.hide,
.none {
    display: none
}
/* 清除浮动 */
.clearfix:after {
    visibility: hidden;
    clear: both;
    display: block;
    content: ".";
    height: 0
}

.clearfix {
    *zoom: 1
}
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