<sup>上标
<sub>下标
<del>删除线
<small>小号字
<ins>插入字
M<sup>2</sup>
5<sup>4</sup>
?
<h1>X<sub>2</sub><sup>4</sup>+Y<sub>1</sub><<sup>3</sup>=<del>100</del></h1>
?
<h1>N<ins>5</ins><small>N</small></h1>
?
?
http://jianzhong5137.blog.163.com/blog/static/9829049201022010858349/
