chromium/third_party/blink/web_tests/fast/table/tableInsideCaption.html

<table>
    <tr>
        <td>
            <table><tr><td>This should all be on one line.</td></tr></table>
            <table>
                <thead>
                    <caption><table><tr><td>Caption</td></tr></table></caption>
                </thead>
                <tbody>
                    <tr>
                        <td>Bottom</td>
                        <td width="100%">line.</td>
                    </tr>
                </tbody>
            </table>
        </td>
    </tr>
</table>