/* v1.0 | 20080212 */
  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, font, 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 {
      margin: 0;
      padding: 0;
      border: 0;
      outline: 0;
      font-size: 100%;
      vertical-align: baseline;
      background: transparent;
  }
  body {
      line-height: 1;
  }
  ol, ul {
      list-style: none;
  }
  blockquote, q {
      quotes: none;
  }
  blockquote:before, blockquote:after,
  q:before, q:after {
      content: '';
      content: none;
  }

    /* No olvides definir estilos para focus */
    :focus {
      outline: 0;
    }
    /* No olvides resaltar de alguna manera el texto insertado/borrado */
    ins {
      text-decoration: none;
    }
    del {
      text-decoration: line-through;
    }
    /* En el código HTML es necesario añadir cellspacing="0" */
    table {
      border-collapse: collapse;
      border-spacing: 0;
    }