When building the accessibility tree we ignore any table rows that are not the direct children of the table object. This happens both for HTML tables and ARIA grids. However there might be cases on the Web where webpage authors have place another element or elements in between the table element and its rows. This element or elements might be important for accessibility and thereby cannot be ignored.
For example:
<table>
<div role="main">
<tr>
...
</tr>
</div>
</table>
Comment 1 by bugdroid1@chromium.org
, Apr 18 2018