edx-platform/lms/static/sass/course/wiki/_basic-html.scss

section.wiki-body {
   h1 {
    font-weight: bold;
    font-size: 2em;
    margin-bottom: 25px;
   }

  div#wiki_article {
    html, address, blockquote, body, dd, div, dl, dt, fieldset, form, frame, frameset, h1, h2, h3, h4, h5, h6, noframes, ol, p, ul, center, dir, hr, menu, pre {
      display: block;
      unicode-bidi: embed;
    }

    li {
      display: list-item;
    }

    head {
      display: none;
    }

    table {
      display: table;
    }

    tr {
      display: table-row;
    }

    thead {
      display: table-header-group;
    }

    tbody {
      display: table-row-group;
    }

    tfoot {
      display: table-footer-group;
    }

    col {
      display: table-column;
    }

    colgroup {
      display: table-column-group;
    }

    td, th {
      display: table-cell;
    }

    caption {
      display: table-caption;
    }

    th {
      font-weight: bolder;
      text-align: center;
    }

    caption {
      text-align: center;
    }

    h1 {
      font-size: 1.6em;
      margin: .67em 0;
      letter-spacing: 0px;
    }

    h2 {
      text-transform: none;
      font-size: 1.4em;
      margin: .75em 0;
      letter-spacing: 0px;
    }

    h3 {
      font-size: 1.2em;
      margin: .83em 0;
    }

    h4 {
      font-size: 1.1em;
    }

    h4, p, blockquote, ul, fieldset, form, ol, dl, dir, menu {
      margin: 1.12em 0;
    }

    h5 {
      font-size: 1em;
      margin: 1.5em 0;
    }

    h6 {
      font-size: 0.5em;
      margin: 1.67em 0;
    }

    b, strong {
      font-weight: bolder;
    }

    blockquote {
      padding: ($baseline/2) $baseline;
      background: #e3e3e3;
      border-left: 4px solid;
    }

    i, cite, em, var, address {
      font-style: italic;
    }

    pre, tt, code, kbd, samp {
      font-family: monospace;
    }

    pre {
      white-space: pre;
    }

    button, textarea, input, select {
      display: inline-block;
    }

    big {
      font-size: 1.17em;
    }

    small, sub, sup {
      font-size: .83em;
    }

    sub {
      vertical-align: sub;
    }

    sup {
      vertical-align: super;
    }

    table {
      border-spacing: 2px;
    }

    thead, tbody, tfoot {
      vertical-align: middle;
    }

    td, th, tr {
      vertical-align: inherit;
    }

    s, strike, del {
      text-decoration: line-through;
    }

    hr {
      height: 1px;
      background: #999;
      border: none;
    }

    ol, ul, dir, menu, dd {
      margin-left: 40px;
    }

    ol {
      list-style-type: decimal;
    }

    ol ul, ul ol, ul ul, ol ol {
      margin-top: 0;
      margin-bottom: 0;
    }

    u, ins {
      text-decoration: underline;
    }

    br:before {
      content: "\A";
      white-space: pre-line;
    }

    center {
      text-align: center;
    }
  }
}