I. about reset.css

Because different browsers have different default styles, in order to avoid browser differences on the page, you need to initialize style sheet properties. It is not advisable to use the wildcard * because it will traverse to every tag, and large web pages will load too slowly, affecting performance. So before we start the project, we need to introduce reset.css to unify the default styles of all html tags.

Recommend a website to download reset.css: https://cssreset.com/ , there are some normalize.css and so on.

 
Commonly used

* {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}
*:before,
*:after {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}
body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, legend, input, button, textarea, p, blockquote, th, td {
    margin: 0;
    padding: 0;
}
body {
    background: #fff;
    color: #555;
    font-size: 14px;
    font-family: "Arial", "Microsoft YaHei", "Blackbody", "Song style", sans-serif;
}
td, th, caption {
    font-size: 14px;
}
h1, h2, h3, h4, h5, h6 {
    font-weight: normal;
    font-size: 100%;
}
address, caption, cite, code, dfn, em, strong, th, var {
    font-style: normal;
    font-weight: normal;
}
a {
    color: #555;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
img {
    border: none;
    vertical-align: middle;
}
ol, ul, li {
    list-style: none;
}
input, textarea, select, button {
    font: 14px "Arial", "Microsoft YaHei", "Blackbody", "Song style", sans-serif;
}
table {
    border-collapse: collapse;
}
html {
    overflow-y: scroll;
}
.clearfix:before,
.clearfix:after {
    content: " ";
    display: inline-block;
    height: 0;
    clear: both;
    visibility: hidden;
}
.clearfix {
    *zoom: 1;
}

/*Public class*/
.fl {
    float: left
}
.fr {
    float: right
}
.al {
    text-align: left
}
.ac {
    text-align: center
}
.ar {
    text-align: right
}
.hide {
    display: none
}

 

Taobao official website style initialization:

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; }