title: Color and empty cell or add text to an empty cell via CSS
body: <p>I am working on an accessibility preview that uses css to highlight potential problems on a page. I am currently trying to find a way using css only, to somehow highlight an empty cell in a table or add text to it that read something like &quot;This is an empty cell and can cause accessibility issues.</p>
  <p>I know of the empty cell option:</p>
  <pre><code>table {
    empty-cells: show;
  }
  </code></pre>
  <p>But I cannot figure out how to then format those empty cells with something that makes them stand out. Not even sure if it is possible via CSS but I figured I would check with brains smarter than mine as I continue to try and figure it out on my own.</p>