画布 1
HTML 标签
  H5 新增
    语义
      header, footer, main, section, nav,
    特性
      canvas, audio, video, details, summary,
  表示文档结构
    html, head, body
    base, meta, title, style, link, script, noscript
  表单
    form, input, buttom, fieldset
    input.type
      text, password, number, submit, reset, button, hidden, image, file, checkbox, radio, ...
  表格
    table, thead, tbody, tr, th, td, caption
  其他
    wbr, br, a, ul, ol, li, pre, span, div