清除页面默认样式

在前端开发中，我们经常会为自己的网页写自己的css，我们会先清空各标签默认的样式。

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
}

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
}