Take a look at this fiddle (in Google Chrome): http://jsfiddle.net/776uaj5b/1/
<div style="background-color: blue;">
<table style="height: 100px;border-spacing: 0;border-collapse: collapse;">
<tr>
<td style="height: 100%;width: 100px;">
<div style="height: 100%;background-color: red;">
BOX1
</div>
</td>
<td style="height: 100%;width: 100px;">
<div style="height: 100%;background-color: red;border-width: 10px;border-color:green;border-style:solid;box-sizing: border-box;">
BOX2
</div>
</td>
</tr>
</table>
</div>
Why is the BOX2 pushed down by the amount of border of BOX1? Is this a bug?
In Firefox and even IE it looks normal.