What is causing Firefox to consistently shave off 1px from the border of table cells?

Why is Firefox removing 1px from the border's value as defined in the CSS file?

.aprovGriditem th
{
   border-collapse: collapse;
   border: 4px solid #BBC6E3;
   padding: 0;
}

UPDATE

<table cellpadding="0"  cellspacing = "1" runat="server" id="tblEmployees" width="100%">
 <tr id="tr1" runat="server" class="aprovGriditem">
   <td>
        <asp:Label ID="Label1" runat="server">
   </td>
</tr>
</table>

When inspecting with firebug, the border's value shows 3. Setting it to 3 results in 2. How can this be resolved?

htmlcssfirefoxhtml-table

Answer №1

While I cannot provide a detailed explanation, my testing with the fiddle has shown that Firefox behaves differently than other browsers when the border-collapse property is applied to only one element type within the table. To resolve this issue, it is recommended to move the border-collapse property to the entire table:

#tblEmployees{
   border-collapse:collapse;
}
.aprovGriditem th
{
   border: 4px solid #BBC6E3;
   padding: 0;
}

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