html - CSS - Add Color with a data attribute - attr(data-color color)

Question

I'm trying to add color to different element with a data attribute in my css but doensn't work ...

I follow this instructions :

The attr() Function: Properties Values Collected from the Edited Document.

W3C

HTML

<table>
    <tr>
        <td>
            <span class="bgborder" data-color="#e7663f"></span>
            <i class="fa fa-copy"></i>
        </td>
        <td>
            <span>Blaablaaablaaa</span>
        </td>
    </tr>
</table>
<table>
    <tr>
        <td>
            <span class="bgborder" data-color="#77c385"></span>
            <i class="fa fa-upload fa-fw"></i>
        </td>
        <td>
            <span>Blablaablaaa</span>
        </td>
    </tr>
</table>

CSS

.bgborder {
    display: block;
    width: 5px;
    height: 100%;
    position: absolute;
    top: 0;
    background-color: attr(data-color color);
}

Nothing appears...Am I right ?

In my chrome inspector I have this :

background-color: attr(data-color color); 
/! Invalid property value

I don't understand why... ???

Thanks for your help :)

Answer 1

You can pass css values from html:

<button style="
    --tooltip-string: 'Ug. Tooltips.';
    --tooltip-color: #f06d06;
    --tooltip-font-size: 11px;
    --tooltip-top: -10px">
  Button
</button>

to css:

button::after {
  content: var(--tooltip-string);
  color: var(--tooltip-color);
  font-size: var(--tooltip-font-size);
}

source: https://css-tricks.com/css-attr-function-got-nothin-custom-properties/ codepen: https://codepen.io/chriscoyier/pen/EbxVME