CSS 垂直对齐，如何去除文本下方的小间距?

问题描述：

我有这个代码.尽管在 td 中，并且指定了这个 CSS:

I have this code. Despite of being inside a td, and having specified this CSS:

.day {
    text-align: right;
    padding: 5px;
    vertical-align: middle;
    border: 1px solid black;
}

.day--hole {
    color: lightgray;
}

.day--today {
    background: pink;
}

<table>
  <tbody>
    <tr>
      <td class="day day--hole">30</td>
      <td class="day day--hole">31</td>
      <td class="day">1</td>
      <td class="day">2</td>
      <td class="day">3</td>
      <td class="day">4</td>
      <td class="day">5</td>
    </tr>
    <tr>
      <td class="day">6</td>
      <td class="day">7</td>
      <td class="day">8</td>
      <td class="day">9</td>
      <td class="day">10</td>
      <td class="day">11</td>
      <td class="day">12</td>
    </tr>
    <tr>
      <td class="day">13</td>
      <td class="day">14</td>
      <td class="day">15</td>
      <td class="day">16</td>
      <td class="day">17</td>
      <td class="day">18</td>
      <td class="day">19</td>
    </tr>
    <tr>
      <td class="day">20</td>
      <td class="day day--today">21</td>
      <td class="day">22</td>
      <td class="day">23</td>
      <td class="day">24</td>
      <td class="day">25</td>
      <td class="day">26</td>
    </tr>
    <tr>
      <td class="day">27</td>
      <td class="day">28</td>
      <td class="day">29</td>
      <td class="day">30</td>
      <td class="day">31</td>
      <td class="day day--hole">1</td>
      <td class="day day--hole">2</td>
    </tr>
  </tbody>
</table>

文本应居中的位置与文本的当前位置之间存在明显的间隙.它看起来比它应该的高"，而不是完全居中.为什么会发生这种情况，如何在不重复更改 HTML 或使用 flexbox 的情况下解决它?

There's a visible gap between the position where the text should be centered and the current position of the text. It looks "upper" than it should and not totally centered. Why does this happen and how can I solve it without recurring to change the HTML or use flexbox?

答

举个例子，我把高度设置得比需要的要高.但是试试下面的例子.height 和 line-height 应该等于使文本居中.

As an example I made the height higher than needed. But give the example below a try. The height and line-height should be equal to center the text.

let height = document.getElementById('height');
let days = Array.from( document.querySelectorAll('.day') );

height.addEventListener('input', () => {
  days.forEach( day => {
    day.style.setProperty( '--height', `${height.value}px` );
  });
});

.day {
    text-align: right;
    padding: 5px;
    height: var(--height);
    line-height: var(--height);
    border: 1px solid black;
}

.day--hole {
    color: lightgray;
}

.day--today {
    background: pink;
}

:root {
  --height: 40px;
}

<form>
  <label for="height">Height (play with it to say that the text remains centered)</label>
  <input type="number" id="height" min="1" value="40">
</form>

<table>
  <tbody>
    <tr>
      <td class="day day--hole">30</td>
      <td class="day day--hole">31</td>
      <td class="day">1</td>
      <td class="day">2</td>
      <td class="day">3</td>
      <td class="day">4</td>
      <td class="day">5</td>
    </tr>
    <tr>
      <td class="day">6</td>
      <td class="day">7</td>
      <td class="day">8</td>
      <td class="day">9</td>
      <td class="day">10</td>
      <td class="day">11</td>
      <td class="day">12</td>
    </tr>
    <tr>
      <td class="day">13</td>
      <td class="day">14</td>
      <td class="day">15</td>
      <td class="day">16</td>
      <td class="day">17</td>
      <td class="day">18</td>
      <td class="day">19</td>
    </tr>
    <tr>
      <td class="day">20</td>
      <td class="day day--today">21</td>
      <td class="day">22</td>
      <td class="day">23</td>
      <td class="day">24</td>
      <td class="day">25</td>
      <td class="day">26</td>
    </tr>
    <tr>
      <td class="day">27</td>
      <td class="day">28</td>
      <td class="day">29</td>
      <td class="day">30</td>
      <td class="day">31</td>
      <td class="day day--hole">1</td>
      <td class="day day--hole">2</td>
    </tr>
  </tbody>
</table>

CSS 垂直对齐，如何去除文本下方的小间距?

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