td-has-header should not always fail <td headers="">

[WilcoFiers]

The td-has-header rule seems to consistently fail <td headers=""> elements. We have some test data that shows that AT will fall back to column / rowheaders in this situation.

<table>
  <tr>
    <th scope="col">Projects</th>
    <th scope="col">Progress</th>
  </tr>
  <tr>
    <td headers="">My Project</td>
    <td>15%</td>
  </tr>
</table>

IE + JAWS: Works
Chrome + JAWS: Works
Firefox + NVDA: Works
Safari + VO: Works

I think we should report this for review. Axe-core should probably still fail if the headers attribute references something that doesn't exist, or something outside the table.

[jeeyyy]

@WilcoFiers did you mean the rule td-headers-attr here?

[WilcoFiers]

Nope. The problem here is that td-has-header stops looking if it finds a headers attribute without associated headers. It should continue looking for column/rowheaders. This is not according to spec, but we have test data showing this happens consistently.

[padmavemulapati]

Its verified as part of the verification of https://github.com/dequelabs/axe-core/issues/2013 , yes we are seeing the results as incomplete which is expected as per the change done here in this ticket.

[straker]

No docs needed