Width issue on tables with rowspan on Safari and Chrome [closed]

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I have a problem with table cell width on tables with rowspan defined on Safari and Chrome. I don't know if it's a bug or if I'm missing anything. This is the simple HTML code to reproduce it:

<table style="width:1000px" border="1">
<tr>
    <td style="width:50px">a1</td>
    <td rowspan="2">b1</td>
    <td rowspan="2">c1</td>
</tr>
<tr>
    <td>a2 and b2 and c2</td>
</tr>
</table>

In Firefox I the first column has a width of 50px, but not in Safari and Chrome (much bigger).