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no-table-cell-overlap

Warns when a <table>'s rowspan / colspan attributes cause two cells to be anchored so that they cover the same slot — a table model error under HTML Living Standard §4.9.12.1 Forming a table, Step 14.

Split out of the former table-row-column-alignment rule, alongside no-table-span-overflow, no-empty-table-track, and consistent-table-row-length. Once a table has an overlap, the grid those three siblings derive from it is speculative, so they report nothing on a table this rule reports on.

❌ Examples of incorrect code for this rule

<table>
  <tr>
    <td></td>
    <td></td>
    <td rowspan="5"></td>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td colspan="5"></td>
  </tr>
  <tr>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
</table>

✅ Examples of correct code for this rule

<table>
  <tr>
    <th rowspan="2">Row span</th>
    <th colspan="2">Col span</th>
  </tr>
  <tr>
    <th>1</th>
    <th>2</th>
  </tr>
</table>

Interface​

{
  "no-table-cell-overlap": boolean
}

Default Severity​

error