1、新建html文档。
3、初始化css代码。<style>article, aside, details, figcaption, figure, footer, header荑樊综鲶, hgroup, main, nav, section, summary { display: block; }audio, canvas, video { display: inline-block; }audio:not([controls]) { display: none; height: 0; }[hidden] { display: none;}html { font-family: sans-serif; -ms-text-size-adjust: 100%; -webkit-text-size-adjust: 100%; }body { margin: 0; }a:focus { outline: thin dotted; }a:active, a:hover { outline: 0; }h1 { font-size: 2em; margin: 0.67em 0; }abbr[title] { border-bottom: 1px dotted; }b, strong { font-weight: bold; }dfn { font-style: italic; }hr { -moz-box-sizing: content-box; box-sizing: content-box; height: 0; }mark { background: #ff0; color: #000; }code, kbd, pre, samp { font-family: monospace, serif; font-size: 1em; }pre { white-space: pre-wrap; }q { quotes: "\201C" "\201D" "\2018" "\2019"; }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: 0; }fieldset { border: 1px solid #c0c0c0; margin: 0 2px; padding: 0.35em 0.625em 0.75em; }legend { border: 0; padding: 0; }button, input, select, textarea { font-family: inherit; font-size: 100%; margin: 0; }button, input { line-height: normal; }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; }input[type="checkbox"], input[type="radio"] { box-sizing: border-box; padding: 0; }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;}button::-moz-focus-inner, input::-moz-focus-inner { border: 0; padding: 0;}textarea { overflow: auto; vertical-align: top; }table { border-collapse: collapse; border-spacing: 0; }</style>
5、代码整体结构。
