css 样式初始化（rem兼容）

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,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,article,aside,canvas,details,embed,figure,figcaption,footer,header,menu,nav,output,ruby,section,summary,time,mark,audio,video,input,button,textarea,select{margin:0;padding:0;font-size:100px;font-weight:normal;color:#666;border:0;vertical-align:baseline}body{line-height:1}ul,ol{list-style:none}input,button,textarea,select,input:focus,textarea:focus{background:0;outline:0}textarea{resize:none;overflow:auto}select{border:0}a,button{cursor:pointer}a{text-decorattion:none;blr:expression(this.onFocus=this.blur())}blockquote,q{quotes:none}blockquote:before,blockquote:after,q:before,q:after{content:none}table{border-collapse:collapse;border-spacing:0}button,input,optgroup,select,textarea{-webkit-appearance:none}a,button,input,optgroup,select,textarea{-webkit-tap-highlight-color:rgba(0,0,0,0)}a,img{-webkit-touch-callout:none}video,img{vertical-align:top}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section,summary,time,mark,audio,video{display:block;margin:0;padding:0}mark{background:0}sub,sup{vertical-align:baseline}:link,:visited,ins{text-decoration:none}:focus{outline:0}::selection{background:#54bd4c;color:#fff}::-moz-selection{background:#54bd4c;color:#fff}::-webkit-selection{background:#54bd4c;color:#fff}.fl{float:left}.fr{float:right}.clear{clear:both}.clearoutline:focus{outline:0}a:link{text-decoration:none;color:#666}

/*iphone6*/

@media(min-device-375px)and(max-device-667px)and(-webkit-min-device-pixel-ratio:2){

    html{font-size:117.1875px;}

}

/*iphone6plus*/

@media(min-device-414px)and(max-device-736px)and(-webkit-min-device-pixel-ratio:3){

    html{font-size:129.375px;}

}

 

 

/* 用于移动端rem匹配 */

/*

* 100px = 1rem

*/

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原文链接：https://blog.csdn.net/qingdahai/article/details/85108880