清除网站设计时的默认值

/* http://meyerweb.com/eric/tools/css/reset/ ???v2.0 | 20110126 ??License: none (public domain)*/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, hgroup, menu, nav, output, ruby, section, summary,time, mark, audio, video { ???margin: 0; ???padding: 0; ???border: 0; ???font-size: 100%; ???font: inherit; ???vertical-align: baseline;}/* HTML5 display-role reset for older browsers */article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { ???display: block;}body { ???line-height: 1;}ol, ul { ???list-style: none;}blockquote, q { ???quotes: none;}blockquote:before, blockquote:after,q:before, q:after { ???content: ‘‘; ???content: none;}table { ???border-collapse: collapse; ???border-spacing: 0;}