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Hello,

We recommed you to apply the border-collapse: collapse style:

$wordStyles = array(
    '<table>' => 'myTableStyle',
);

$html = '<table width="100%" style="border-collapse: collapse">
            <tbody>
                <tr>
                    <td>1</td>
                    <td>2</td>
                    <td>3</td>
                </tr>
                <tr>
                    <td>4</td>
                    <td>5</td>
                    <td>6</td>
                </tr>
            </tbody>
        </table>';
$docx->embedHTML($html, array('parseAnchors' => true, 'useHTMLExtended' => true, 'customListStyles' => true, 'wordStyles' => $wordStyles));

Otherwise, you need to remove the styles added as default using the strictWordStyles option, but this may require setting more styles to the content:

$wordStyles = array(
    '<table>' => 'myTableStyle',
);

$html = '<table width="100%">
            <tbody>
                <tr>
                    <td>1</td>
                    <td>2</td>
                    <td>3</td>
                </tr>
                <tr>
                    <td>4</td>
                    <td>5</td>
                    <td>6</td>
                </tr>
            </tbody>
        </table>';
$docx->embedHTML($html, array('parseAnchors' => true, 'useHTMLExtended' => true, 'customListStyles' => true, 'wordStyles' => $wordStyles, 'strictWordStyles' => true));

Regards.