Utilizing nested selectors in HTML tables

I'm struggling to figure out how to select a specific cell within a colgroup. Here's an example of what I'm trying to achieve:

table {
  position:relative;
  top:50px;
  margin:0 auto;
  border-collapse:collapse;
}

td, th {
  border:1px solid black;
  width:75px;
  height:25px;
}

.first {
  background-color:red;
}

.second {
  background-color:yellow;
}

.third {
  background-color:green;
}

.cell {
  background-color:white;
}

.first .cell {
  text-align:left;
  border:5px solid black;
  color:red;
}

.second > .cell {
  text-align:center;
  border:5px solid black;
  color:red;
}

.third .cell {
  text-align:right;
  border:5px solid black;
  color:red;
}
<table>
  <colgroup>
    <col span=2 class='first'>
    <col span=2 class='second'>
    <col span=2 class='third'> 
  </colgroup>
  <thead>
    <th colspan=6>asdad</th>
  </thead>
  <tbody>
    <tr>
      <th>asdad</th>
      <td class='cell'>One</td>
      <th>asdad</th>
      <td>fghfghf</td>
      <th>sdadsad</th>
      <td>yututu</td>
    </tr>
        <tr>
      <th>asdad</th>
      <td>jhkjhk</td>
      <th>asdad</th>
      <td class='cell'>Two</td>
      <th>sdadsad</th>
      <td>yututu</td>
    </tr>
    <tr>
      <th>asdad</th>
      <td>jhkjhk</td>
      <th>asdad</th>
      <td>fghfghf</td>
      <th>sdadsad</th>
      <td class='cell'>Three</td>
    </tr>
  </tbody>
</table>

I've tried various selectors from here, but none seem to be working. How can I accomplish my goal? I also want to be able to select the #cell elements using JavaScript or jQuery. $('.first #cell') is not working for me. $('.first').find('#cell') has also been unsuccessful.

Answer №1

First and foremost, it is important to remember that ids should be unique on a page. This uniqueness is the core concept behind using ids. Therefore, the idea of "finding the first occurrence of #cell" seems unusual.

If you have the ability to assign ids to the table cells you wish to select, the process becomes simple: Just select them by their unique id:

#cell1
#cell2
#cell3
…

The same principle applies in jQuery:

$('#cell1')
$('#cell2')
$('#cell3')
…

However, if you need to select a specific cell without an id (or class), things can become more complex. You may consider using the nth-child-selector. https://www.w3schools.com/cssref/sel_nth-child.asp

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