代码示例:(标识:css_table_width_2)
<!DOCTYPE html>
<html>
<head>
<style>
table, td, th {
  border: 1px solid black;
}

table {
  border-collapse: collapse;
  width: 50%;
}

th {
  height: 70px;
}
</style>
</head>
<body>

<h1>width 和 height 属性</h1>
<p>设置表格的宽度,以及表格标题行的高度:</p>

<table>
  <tr>
    <th>Firstname</th>
    <th>Lastname</th>
    <th>Savings</th>
  </tr>
  <tr>
    <td>Bill</td>
    <td>Gates</td>
    <td>$100</td>
  </tr>
  <tr>
    <td>Steve</td>
    <td>Jobs</td>
    <td>$150</td>
  </tr>
  <tr>
    <td>Elon</td>
    <td>Musk</td>
    <td>$300</td>
  </tr>
  <tr>
    <td>Mark</td>
    <td>Zuckerberg</td>
    <td>$250</td>
  </tr>
</table>

</body>
</html>
运行结果: