<table border="">
    <tr>    
        <td style="height: 200px;">
            <div style="height: 100px; background-color: yellow; width: 20px;"></div>
            <table border="" style="height: 100%;">
                <tr>
                    <td>
                        <div>
                            <div style="height: 100%; border: solid blue;"></div>
                        </div>
                        <div style="height: 300px; background-color: green; width: 100px;"></div>
                    </td>
                </tr>
            </table>
        </td>
    </tr>
</table>