CSS styles are unresponsive when applied to a col element within a colgroup

Here is the code I am currently working with:

<table>
            <colgroup>
                <col class="left">
                <col>
            </colgroup>
            <thead>
                <tr>
                    <th scope="col">HTML tag</th>
                    <th scope="col">Use</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>table</td>
                    <td>Creates the table element</td>
                </tr>
                <tr>
                    <td>thead</td>
                    <td>Wraps the heading section</td>
                </tr>
                <tr>
                    <td>tbody</td>
                    <td>Wraps the main body of the table</td>
                </tr>
                <tr>
                    <td>tfoot</td>
                    <td>Wraps the footer of the table</td>
                </tr>
                <tr>
                    <td>tr</td>
                    <td>Creates a row</td>
                </tr>
                <tr>
                    <td>th</td>
                    <td>Creates a heading cell</td>
                </tr>
                <tr>
                    <td>td</td>
                    <td>Creates a data cell</td>
                </tr>
            </tbody>
        </table>

Additionally, here is the CSS rule that I have applied:

.left {
    font-family: monospace;
    font-weight: bold;
}

Despite applying the CSS rule to change the column's font style, nothing seems to be happening. There are no other font-family or font-weight rules in the stylesheet. When inspecting the elements and hovering over the col, the entire column appears to be affected by the CSS rule. I feel like the solution might be something simple and obvious, but for some reason, I can't seem to identify the problem.

Answer №1

Since elements are not directly related to the parent element, they do not inherit styles from colgroup.

If a table does not have a colspan attribute, you can utilize the td:nth-child(an+b) CSS selector for each column, where a represents the total number of columns and b is the position of the column in the table. The style should only be applied after using this selector.

If the table uses a colspan attribute, you may achieve the desired effect by combining appropriate CSS attribute selectors like [colspan=n], although this process isn't straightforward.

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/colgroup

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/col

.left {
    font-family: monospace;
    font-weight: bold;
    color: red;
}

td:nth-child(1) {
font-family: monospace;
    font-weight: bold;
    color: blue;
}
<table>
            <colgroup>
                <col class="left">
                <col>
            </colgroup>
            <thead>
                <tr>
                    <th scope="col">HTML tag</th>
                    <th scope="col">Use</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>table</td>
                    <td>Creates the table element</td>
                </tr>
                <tr>
                    <td>thead</td>
                    <td>Wraps the heading section</td>
                </tr>
                <tr>
                    <td>tbody</td>
                    <td>Wraps the main body of the table</td>
                </tr>
                <tr>
                    <td>tfoot</td>
                    <td>Wraps the footer of the table</td>
                </tr>
                <tr>
                    <td>tr</td>
                    <td>Creates a row</td>
                </tr>
                <tr>
                    <td>th</td>
                    <td>Creates a heading cell</td>
                </tr>
                <tr>
                    <td>td</td>
                    <td>Creates a data cell</td>
                </tr>
            </tbody>
        </table>

Best regards

Answer №2

When working with <col> and <column-group> elements, remember that according to the W3 specification, you are limited to applying only the following 4 properties: border, background, width, and visibility.

For more information, visit the official W3 website at https://www.w3.org/TR/CSS21/tables.html#columns

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