JSFiddle - React, Tailwind, and code Playground

HTML

<table id="o"><tr>
  <td>
    <table><tr>
      <td>внутри</td>
    </tr></table>
  </td>
  <td>
    снаружи
  </td>
</tr></table>

CSS

#o td:hover {color: #f00;}
#o td:hover td {color: #000;}