Canvas inside table - html

Question

I have a markup:
<table cellpadding="0" cellspacing="0" class="table_report_line">
<tbody>
<tr>
<td>
<div class="dvlefttable">
</div>
</td>
<td class="dvtoptable" colspan="4" width="100%">
Test
</td>
<td>
<div class="dvrighttable">
</div>
</td>
</tr>
<tr>
<canvas id="chartId" width="400" height="400" style="margin: 30px;">
</canvas>
</tr>
<tr>
<td>
</td>
<td colspan="4">
<br style="line-height: 15px;" />
</td>
<td>
</td>
</tr>
<tr>
<td colspan="6" class="bg_bottom_table">
</td>
</tr>
</tbody>
</table>
but when Firefox renders the page I see that it put canvas outside the table
<canvas id="chartId" style="margin: 30px;" height="400" width="400"> </canvas>
<table cellspacing="0" cellpadding="0" class="table_report_line">
<tbody>
<tr>
<td class="">
<div class="dvlefttable">
</div>
</td>
<td width="100%" colspan="4" class="dvtoptable">
Test
</td>
<td class="">
<div class="dvrighttable">
</div>
</td>
</tr>
<tr>
</tr>
<tr style="background: none repeat scroll 0% 0% transparent;">
<td class="td_border_left">
</td>
<td colspan="4" class="td_padding_left">
<br style="line-height: 15px;">
</td>
<td class="td_border_right">
</td>
</tr>
<tr>
<td class="bg_bottom_table" colspan="6">
</td>
</tr>
</tbody>
</table>
Why does it happen and how it possible to fix that?

Answer 1

You have to put the CANVAS inside of a TD element.
Change:
<tr>
<canvas id="chartId" width="400" height="400" style="margin: 30px;"></canvas>
</tr>
to:
<tr>
<td><canvas id="chartId" width="400" height="400" style="margin: 30px;"></canvas></td>
</tr>
General rule of thumb in cases like this is to use the HTML validator to see what you did wrong.