<style>
td {
  border: 1px solid black;
  width: 120px;
  height: 120px;
}
td div {
    height: 100%;
    width: 100%;
}
th {
    padding: 5px;
}
</style>


<table border="1">
    <tr><th colspan="6">text-align not specified</th></tr>
    <tr><th colspan="2" rowspan="2">&nbsp;</th><th colspan="4">-webkit-writing-mode</th></tr>
    <tr><th>horizontal-tb</th><th>horizontal-bt</th><th>vertical-lr</th><th>vertical-rl</th></tr>
    <tr>
        <th rowspan="4">direction</th>
        <th>ltr</th>
        <td>
            <div style="-webkit-writing-mode:horizontal-tb; direction:ltr">
                <details><summary>summary</summary></details>
                <details open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:horizontal-bt; direction:ltr">
                <details><summary>summary</summary></details>
                <details open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-lr; direction:ltr">
                <details><summary>summary</summary></details>
                <details open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-rl; direction:ltr">
                <details><summary>summary</summary></details>
                <details open><summary>summary</summary></details>
            </div>
        </td>
    </tr>
    <tr>
        <th>rtl</th>
        <td>
            <div style="-webkit-writing-mode:horizontal-tb; direction:rtl">
                <details><summary>summary</summary></details>
                <details open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:horizontal-bt; direction:rtl">
                <details><summary>summary</summary></details>
                <details open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-lr; direction:rtl">
                <details><summary>summary</summary></details>
                <details open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-rl; direction:rtl">
                <details><summary>summary</summary></details>
                <details open><summary>summary</summary></details>
            </div>
        </td>
    </tr>
</table>

<br>
<table border="1">
    <tr><th colspan="6">text-align: left</th></tr>
    <tr><th colspan="2" rowspan="2">&nbsp;</th><th colspan="4">-webkit-writing-mode</th></tr>
    <tr><th>horizontal-tb</th><th>horizontal-bt</th><th>vertical-lr</th><th>vertical-rl</th></tr>
    <tr>
        <th rowspan="4">direction</th>
        <th>ltr</th>
        <td>
            <div style="-webkit-writing-mode:horizontal-tb; direction:ltr">
                <details style="text-align:left"><summary>summary</summary></details>
                <details style="text-align:left" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:horizontal-bt; direction:ltr">
                <details style="text-align:left"><summary>summary</summary></details>
                <details style="text-align:left" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-lr; direction:ltr">
                <details style="text-align:left"><summary>summary</summary></details>
                <details style="text-align:left" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-rl; direction:ltr">
                <details style="text-align:left"><summary>summary</summary></details>
                <details style="text-align:left" open><summary>summary</summary></details>
            </div>
        </td>
    </tr>
    <tr>
        <th>rtl</th>
        <td>
            <div style="-webkit-writing-mode:horizontal-tb; direction:rtl">
                <details style="text-align:left"><summary>summary</summary></details>
                <details style="text-align:left" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:horizontal-bt; direction:rtl">
                <details style="text-align:left"><summary>summary</summary></details>
                <details style="text-align:left" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-lr; direction:rtl">
                <details style="text-align:left"><summary>summary</summary></details>
                <details style="text-align:left" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-rl; direction:rtl">
                <details style="text-align:left"><summary>summary</summary></details>
                <details style="text-align:left" open><summary>summary</summary></details>
            </div>
        </td>
    </tr>
</table>


<br>
<table border="1">
    <tr><th colspan="6">text-align: center</th></tr>
    <tr><th colspan="2" rowspan="2">&nbsp;</th><th colspan="4">-webkit-writing-mode</th></tr>
    <tr><th>horizontal-tb</th><th>horizontal-bt</th><th>vertical-lr</th><th>vertical-rl</th></tr>
    <tr>
        <th rowspan="4">direction</th>
        <th>ltr</th>
        <td>
            <div style="-webkit-writing-mode:horizontal-tb; direction:ltr">
                <details style="text-align:center"><summary>summary</summary></details>
                <details style="text-align:center" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:horizontal-bt; direction:ltr">
                <details style="text-align:center"><summary>summary</summary></details>
                <details style="text-align:center" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-lr; direction:ltr">
                <details style="text-align:center"><summary>summary</summary></details>
                <details style="text-align:center" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-rl; direction:ltr">
                <details style="text-align:center"><summary>summary</summary></details>
                <details style="text-align:center" open><summary>summary</summary></details>
            </div>
        </td>
    </tr>
    <tr>
        <th>rtl</th>
        <td>
            <div style="-webkit-writing-mode:horizontal-tb; direction:rtl">
                <details style="text-align:center"><summary>summary</summary></details>
                <details style="text-align:center" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:horizontal-bt; direction:rtl">
                <details style="text-align:center"><summary>summary</summary></details>
                <details style="text-align:center" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-lr; direction:rtl">
                <details style="text-align:center"><summary>summary</summary></details>
                <details style="text-align:center" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-rl; direction:rtl">
                <details style="text-align:center"><summary>summary</summary></details>
                <details style="text-align:center" open><summary>summary</summary></details>
            </div>
        </td>
    </tr>
</table>


<br>
<table border="1">
    <tr><th colspan="6">text-align: right</th></tr>
    <tr><th colspan="2" rowspan="2">&nbsp;</th><th colspan="4">-webkit-writing-mode</th></tr>
    <tr><th>horizontal-tb</th><th>horizontal-bt</th><th>vertical-lr</th><th>vertical-rl</th></tr>
    <tr>
        <th rowspan="4">direction</th>
        <th>ltr</th>
        <td>
            <div style="-webkit-writing-mode:horizontal-tb; direction:ltr">
                <details style="text-align:right"><summary>summary</summary></details>
                <details style="text-align:right" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:horizontal-bt; direction:ltr">
                <details style="text-align:right"><summary>summary</summary></details>
                <details style="text-align:right" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-lr; direction:ltr">
                <details style="text-align:right"><summary>summary</summary></details>
                <details style="text-align:right" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-rl; direction:ltr">
                <details style="text-align:right"><summary>summary</summary></details>
                <details style="text-align:right" open><summary>summary</summary></details>
            </div>
        </td>
    </tr>
    <tr>
        <th>rtl</th>
        <td>
            <div style="-webkit-writing-mode:horizontal-tb; direction:rtl">
                <details style="text-align:right"><summary>summary</summary></details>
                <details style="text-align:right" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:horizontal-bt; direction:rtl">
                <details style="text-align:right"><summary>summary</summary></details>
                <details style="text-align:right" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-lr; direction:rtl">
                <details style="text-align:right"><summary>summary</summary></details>
                <details style="text-align:right" open><summary>summary</summary></details>
            </div>
        </td>
        <td>
            <div style="-webkit-writing-mode:vertical-rl; direction:rtl">
                <details style="text-align:right"><summary>summary</summary></details>
                <details style="text-align:right" open><summary>summary</summary></details>
            </div>
        </td>
    </tr>
</table>