table高亮

最近在工作过程中，突然出现了一个好久没使用的东西了，其实主要还是关于伪元素的使用，不要小看这两个::冒号，其实他的能量其实很大的呢！！！

下面举个梨子：

html:

<main>
  <table>
    <thead>
      <tr>
        <th></th>
        <th class="col">50kg</th>
        <th class="col">55kg</th>
        <th class="col">60kg</th>
        <th class="col">65kg</th>
        <th class="col">70kg</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <th class="row">160cm</th>
        <td>20</td>
        <td>21</td>
        <td>23</td>
        <td>25</td>
        <td>27</td>
      </tr>

      <tr>
        <th class="row">165cm</th>
        <td>18</td>
        <td>20</td>
        <td>22</td>
        <td>24</td>
        <td>26</td>
      </tr>

      <tr>
        <th class="row">170cm</th>
        <td>17</td>
        <td>19</td>
        <td>21</td>
        <td>23</td>
        <td>25</td>
      </tr>

      <tr>
        <th class="row">175cm</th>
        <td>16</td>
        <td>18</td>
        <td>20</td>
        <td>22</td>
        <td>24</td>
      </tr>
    <tbody>
  </table>
</main>

css：

table {
  overflow: hidden;
}

td, th {
  padding: 10px;
  position: relative;
  outline: 0;
}

body:not(.nohover) tbody tr:hover {
  background-color: #ffa;
}

td:hover::after,
thead th:not(:empty):hover::after,
td:focus::after,
thead th:not(:empty):focus::after { 
  content: '';  
  height: 10000px;
  left: 0;
  position: absolute;  
  top: -5000px;
  width: 100%;
  z-index: -1;
}

td:hover::after,
th:hover::after {
  background-color: #ffa;
}

td:focus::after,
th:focus::after {
  background-color: lightblue;
}

/* Focus stuff for mobile */
td:focus::before,
tbody th:focus::before {
  background-color: lightblue;
  content: '';  
  height: 100%;
  top: 0;
  left: -5000px;
  position: absolute;  
  width: 10000px;
  z-index: -1;
}

js：

无

效果：

以上