首先说一下，为何要用重置样式
除了省心之外，还有两个好处
1.方便设计师/程序员发挥
白纸的感觉确实好。各种margin，padding，border的为0。。。
2.便于发现前端代码的遗漏
用了reset后，如果“blockquote、ol、ul、hn等语义元素在没有赋以其他合理的样式”，会非常扎眼（任何人都看得出来），开发者第一反应会是“卧槽忘了写”并迅速补救。并迅速补救。但如果没reset，浏览器会提供“勉强可以”的默认样式，很多人可能就发现不了或者会想“可能就这么设计的吧”，开发者即使意识到因为遗漏导致和设计稿不一致，出于人性弱点也可能会想“还要赶下一个项目呢先这么凑合着吧”――由于破窗效应，这可能会导致越来越多的“凑合着吧”
pc端:
html{font-family:"Microsoft YaHei UI","Microsoft YaHei",sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} html,body,div,object,iframe,applet,object,h1,h2,h3,h4,h5,h6,p,blockquote,pre,address,dl,dt,dd,ol,ul,li,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,progress{margin:0;padding:0;border:0;vertical-align:baseline} li{list-style:none} article,aside,details,figcaption,figure,footer,header,main,menu,nav,section,summary{display:block} audio,canvas,progress,video{display:inline-block} audio:not([controls]){display:none;height:0} [hidden],template{display:none} a{background-color:transparent;text-decoration:none} a:active,a:hover{outline:0} abbr[title]{border-bottom:1px dotted} b,strong{font-weight:bold} dfn{font-style:italic} h1{font-size:2em;margin:.67em 0} mark{background:#ff0;color:#000} small{font-size:80%} sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline} sup{top:-0.5em} sub{bottom:-0.25em} img{border:0} svg:not(:root){overflow:hidden} figure{margin:1em 40px} hr{-moz-box-sizing:content-box;box-sizing:content-box;height:0} pre{overflow:auto} code,kbd,pre,samp{font-family:monospace,monospace;font-size:1em} button,input,optgroup,select,textarea{color:inherit;font:inherit;margin:0;outline:none;line-height:normal} button{overflow:visible} button,select{text-transform:none} button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer} button[disabled],html input[disabled]{cursor:default} button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0} input{line-height:normal} input[type="checkbox"],input[type="radio"]{box-sizing:border-box;padding:0} input[type="number"]::-webkit-inner-spin-button,input[type="number"]::-webkit-outer-spin-button{height:auto} input[type="search"]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box} input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{-webkit-appearance:none} fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em} legend{border:0;padding:0} textarea{overflow:auto} optgroup{font-weight:bold} table{border-collapse:collapse;border-spacing:0} td,th{padding:0} 移动端:
html{font-family: "Helvetica Neue", Helvetica, STHeiTi, sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} html,body{-webkit-user-select:none;user-select:none;} html,body,div,object,iframe,applet,object,h1,h2,h3,h4,h5,h6,p,blockquote,pre,address,dl,dt,dd,ol,ul,li,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,progress{margin:0;padding:0;border:0;vertical-align:baseline} a{text-decoration:none;-webkit-touch-callout:none;background-color:transparent} li{list-style:none} article,aside,details,figcaption,figure,footer,header,main,menu,nav,section,summary{display:block} audio,canvas,progress,video{display:inline-block} audio:not([controls]){display:none;height:0} [hidden],template{display:none} a:active,a:hover{outline:0} abbr[title]{border-bottom:1px dotted} b,strong{font-weight:bold} dfn{font-style:italic} h1{font-size:2em;margin:.67em 0} small{font-size:80%} sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline} sup{top:-0.5em} sub{bottom:-0.25em} img{border:0;-webkit-touch-callout:none;} svg:not(:root){overflow:hidden} figure{margin:1em 40px} hr{-moz-box-sizing:content-box;box-sizing:content-box;height:0} pre{overflow:auto} code,kbd,pre,samp{font-family:monospace,monospace;font-size:1em} a,button,input,optgroup,select,textarea{-webkit-tap-highlight-color:rgba(0,0,0,0);} button,input,optgroup,select,textarea{color:inherit;font:inherit;margin:0;-webkit-appearance:none;outline:none;line-height:normal} button{overflow:visible} button,select{text-transform:none} button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer} button[disabled],html input[disabled]{cursor:default} button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0} input{line-height:normal} input[type="checkbox"],input[type="radio"]{box-sizing:border-box;padding:0} input[type="number"]::-webkit-inner-spin-button,input[type="number"]::-webkit-outer-spin-button{height:auto} input[type="search"]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box} input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{-webkit-appearance:none} fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em} legend{border:0;padding:0} textarea{overflow:auto} optgroup{font-weight:bold} table{border-collapse:collapse;border-spacing:0} td,th{padding:0} 如有不足请多多指教！希望给您带来帮助！
参考文献：https://blog.csdn.net/jiang_my/article/details/75125781
文章来源: pc端和移动端默认样式重置