HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>table cell toggle</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    table { border-collapse: collapse; }
    td { border: 1px solid #cbd5e1; padding: 10px 16px; cursor: pointer; }
    td.selected { background: #fef08a; font-weight: bold; }
    p { margin-top: 12px; color: #64748b; font-size: 0.9em; }
  </style>
</head>
<body>
  <table>
    <tr><td>A1</td><td>B1</td><td>C1</td></tr>
    <tr><td>A2</td><td>B2</td><td>C2</td></tr>
  </table>
  <p>Click cells — 1st click adds .selected, 2nd removes. jQuery 1.12.4 legacy API.</p>
  <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
  <script>
    $("td").toggle(
      function() {
        $(this).addClass("selected");
      },
      function() {
        $(this).removeClass("selected");
      }
    );
  </script>
</body>
</html>

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jQuery .toggle(fn, fn) — table cell selection (Try It)