table {
  width: 90%;
}
td {
  width: 30%;
}
tr {
  /** what should go here? **/
}

<table>
  <tr>
    <td>1</td>
    <td>2</td>
    <td>3</td>
  </tr>
  <tr>
    <td>4</td>
    <td>5</td>
    <td>6</td>
  </tr>
  <tr>
    <td>7</td>
    <td>8</td>
    <td>9</td>
  </tr>
<table>

解决方法@H_502_8@

您可以使用以下技术： Grid of responsive squares。

使用表格和方形表单元格适应您的用户名，它将如下所示：

table {
  width: 90%;
}
td {
  width: 33.33%;
  position: relative;
}
td:after {
  content: '';
  display: block;
  margin-top: 100%;
}
td .content {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: gold;
}

<table>
  <tr>
    <td><div class="content">1</div></td>
    <td><div class="content">1</div></td>
    <td><div class="content">1</div></td>
  </tr>
  <tr>
    <td><div class="content">1</div></td>
    <td><div class="content">1</div></td>
    <td><div class="content">1</div></td>
  </tr>
  <tr>
    <td><div class="content">1</div></td>
    <td><div class="content">1</div></td>
    <td><div class="content">1</div></td>
  </tr>
<table>

FIDDLE demo