Running ./mach mochitest --disable-e10s --no-autorun accessible/tests/mochitest/text/test_atcaretoffset.html generates the following table:

<table xmlns="http://www.w3.org/1999/xhtml" cellspacing="0" cellpadding="0">
          
            <tbody id="test-table">
              <tr xmlns="http://www.w3.org/1999/xhtml">
                <td>Passed</td>
                <td>Failed</td>
                <td>Todo</td>
                <td>Test Files</td>
              </tr>
            <tr class="" id="tr-chrome://mochitests/content/a11y/accessible/tests/mochitest/text/test_atcaretoffset.html"><td>0</td>
<td>0</td>
<td>0</td>
<td style="padding-left: 0px"><a>chrome://mochitests/content/a11y/accessible/tests/mochitest/text/test_atcaretoffset.html</a>
</td>
</tr>
</tbody>
          </table>

See <a>chrome://mochitests/content/a11y/accessible/tests/mochitest/text/test_atcaretoffset.html</a> part.

The priority flag is not set for this bug.
:ahal, could you have a look please?

For more information, please visit auto_nag documentation.

Because this bug's Severity has not been changed from the default since it was filed, and it's Priority is P3 (Backlog,) indicating it has been triaged, the bug's Severity is being updated to S3 (normal.)