Export to CSV using jQuery and html recursively get css :before content

Question

This is a question based on an answer to another question.

Please see this:

Export to CSV using jQuery and html

Regarding the code text = $col.text(); if there is a CSS :before content, I get text = " ", because the cell is

<td><div id="state" class="state-c"> </div></td>

but actually the generated HTML shows a string in that cell because of the CSS style:

.state-c:before {
    content: "Confirmed";
}

I tried with:

text = $col.text();
if (text.length < 2) { // text.length is always longer than 2 except when is = " "
    text = window.getComputedStyle($('#state')[0], ':before').content;
}

and many variations of this code like window.getComputedStyle($(col)[0], ':before').content;, etc, but I can't find a way to make it work inside that code, while it works perfectly in other contexts.

Is it possible to get the the string of the CSS :before content in this described way?