Design the border of the highlighted section within the table using CSS

Is there a way to access the edge (top, left, right, bottom) width css for a selectable table using jQuery UI selectable, or do I need to use JavaScript?

Update: By "accessing the edge," I mean creating a border around a selected area in a table (selecting td elements, first .ui-selected in tr, last .ui-selected in tr, first tr containing .ui-selected, last tr containing .ui-selected).

<table class="ui-selectable">
    <tr>
        <td class="ui-selectee"></td>
        <td class="ui-selectee"></td>
        <td class="ui-selectee"></td>
        <td class="ui-selectee"></td>
    </tr>
    <tr>
        <td class="ui-selectee"></td>
        <td class="ui-selectee ui-selected"></td>
        <td class="ui-selectee ui-selected"></td>
        <td class="ui-selectee"></td>
    </tr>
    <tr>
        <td class="ui-selectee"></td>
        <td class="ui-selectee ui-selected"></td>
        <td class="ui-selectee ui-selected"></td>
        <td class="ui-selectee"></td>
    </tr>
    <tr>
        <td class="ui-selectee"></td>
        <td class="ui-selectee"></td>
        <td class="ui-selectee"></td>
        <td class="ui-selectee"></td>
    </tr>
</table>

For example, to style the left edge:

.ui-selected {
    border-left: 1px solid #00F;
}
.ui-selected ~ .ui-selected {
    border-left: none;
}
csshtml-tablecss-selectorspseudo-class

Answer №1

On the left side:

Select the first child of td element

On the right side:

Select the last child of td element

At the top:

Select the first child of tr element within a td element

At the bottom:

Select the last child of tr element within a td element

Edit: After making some modifications, it appears that achieving this in CSS3 is not possible. However, CSS4's :nth-match and :nth-last-match (currently not supported and still in draft stage) will potentially offer a solution.

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