CSS3 initialization

Different browsers have different default values for some tags. In order to eliminate the differences in the rendering of HTML text by different browsers and take care of browser compatibility, we need to initialize CSS.
Simple understanding: CSS initialization refers to resetting the browser's style. (Also known as CSS reset)
Every web page must be initialized with CSS first.
Here we take Jingdong css initialization code as an example:

/* 把我们所有标签的内外边距清零 */
* {
    margin: 0;
    padding: 0;
    /* css3盒子模型 */
    box-sizing: border-box;
}
/* 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
}

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;
    /* 默认有灰色边框我们需要手动去掉 */
    border: 0; 
    outline: none;
}

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
}
/*Unicode编码字体:
把中文字体的名称用相应的Unicode编码来代替, 这样就可以有效的避免浏览器解释CSS代码时候出现乱码*/

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

.clearfix {
    *zoom: 1
}

Unicode encoding font:
replace the name of the Chinese font with the corresponding Unicode encoding, which can effectively avoid garbled characters when the browser interprets the CSS code

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