The reason why the css code is initialized is to minimize compatibility issues between browsers!

The reason why the css code is initialized is to minimize compatibility issues between browsers!

Tencent QQ official website style initialization

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"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 }

Sina official website style initialization

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;}

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, 5b8b4f53; }
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; }

NetEase official website style initialization

html {overflow-y:scroll;}
body {margin:0; padding:29px00; font:12px"5B8B4F53",sans-serif;background :#ffffff;}
div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,blockquote,p{padding:0; margin:0;}
table,td,tr,th{font-size:12px;}
li{list-style-type:none;}
img{vertical-align:top;border:0;}
ol, ul {list-style:none;}
h1,h2,h3,h4,h5,h6{font-size:12px; font-weight:normal;}
address,cite,code,em,th {font-weight: normal; font-style:normal;}