JSFiddle - React, Tailwind, and code Playground

HTML

<table><tr id="rows">
    <td style="right:0%;"></td>
    <td style="right:20%;"></td>
    <td style="right:40%;"></td>
    <td style="right:60%;"></td>
    <td style="right:80%;"></td>
</tr>
</table>

JavaScript

alert($('#rows td').last().attr('style').match(/\d+/)+'%');