SOURCE

<h1>h1</h1>
<h2>h2</h2>
<h3>h3</h3>
<hr>
<h4>h4</h4>

<a href>这是一个链接</a>

<b>加粗文本</b><br><br>
<i>斜体文本</i><br><br>
<code>电脑自动输出</code><br><br>
这是 <sub> 下标</sub> 和 <sup> 上标</sup>

<table border="1">
    <thead>
        <td>Header 1</td>
        <th>Header 2</th>
    </thead>
    <tr>
        <th>Header 1</th>
        <th>Header 2</th>
    </tr>
    <tr>
        <td>row 1, cell 1</td>
        <td>row 1, cell 2</td>
    </tr>
    <tr>
        <td>row 2, cell 1</td>
        <td>row 2, cell 2</td>
    </tr>
</table>

h2{
  font-size: 40px;
}

table{
  border:solid blue ;
  border-width:3px 0px 0px 3px;
}

th,td{
  border:solid blue ;
  border-width:0px 3px 3px 0px;
}