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請幫助我在加入多個html表時防止出現雙邊框。我試圖使用「邊界崩潰:崩潰」,但它不工作。兩個表格之間的邊界仍然是兩倍。加入多個html表時防止出現雙邊框 - border-collapse不起作用
<table style="border:1px solid black;border-collapse:collapse;width:100%">
\t <tr>
\t \t <td rowspan="3">Heading-1</td>
\t \t <td>Heading-2</td>
\t \t <td>Heading-3</td>
\t </tr>
\t <tr>
\t \t <td>Heading-4</td>
\t \t <td>Heading-5</td>
\t </tr>
\t <tr>
\t \t <td>Heading-6</td>
\t \t <td>Heading-7</td>
\t </tr>
</table>
<table style="border:1px solid black;border-collapse:collapse;width:100%">
\t <tr>
\t \t <td rowspan="3">Heading-1</td>
\t \t <td>Heading-2</td>
\t \t <td>Heading-3</td>
\t </tr>
\t <tr>
\t \t <td>Heading-4</td>
\t \t <td>Heading-5</td>
\t </tr>
\t <tr>
\t \t <td>Heading-6</td>
\t \t <td>Heading-7</td>
\t </tr>
</table>
<table style="border:1px solid black;border-collapse:collapse;width:100%">
\t <tr>
\t \t <td rowspan="3">Heading-1</td>
\t \t <td>Heading-2</td>
\t \t <td>Heading-3</td>
\t </tr>
\t <tr>
\t \t <td>Heading-4</td>
\t \t <td>Heading-5</td>
\t </tr>
\t <tr>
\t \t <td>Heading-6</td>
\t \t <td>Heading-7</td>
\t </tr>
</table>