tr with fixed height shrinking below height of content

[ericbf]

It seems that WeasyPrint treats the height of tr elements different than the browser, causing inconsistent table row heights for table rows with a fixed height less than the size of the content therein.

In the browser, if the height of a tr is less than the height of the content, the tr will take the height of the content instead:

However, when that same markup is rendered into a PDF with WeasyPrint, the tr will actually use the lesser height, not expanding to the height of the content as expected:

This is not the case for the td elements, where setting a height smaller than the content does not cause the td to shrink below the size of the content (see the same example above).

Maybe it has to do with the padding on the tds? It seems to be squashing the vertical cell padding. Not sure exactly what behavior is taking place, technically.

Here’s the markup for the example:

<table style="border-collapse: collapse; width: 100%; border: 1px solid rgb(126, 140, 141);" border="1">
	<tbody>
		<tr style="height: 100px;">
			<td style="padding: 5px; vertical-align: middle; border: 1px solid rgb(126, 140, 141); width: 100%;">Tall Row</td>
		</tr>
		<tr>
			<td style="padding: 5px; height: 100px; vertical-align: middle; border: 1px solid rgb(126, 140, 141); width: 100%;">Tall Cell</td>
		</tr>
		<tr style="height: 5px;">
			<td style="padding: 5px; vertical-align: middle; border: 1px solid rgb(126, 140, 141); width: 100%;">Short Row</td>
		</tr>
		<tr>
			<td style="padding: 5px; height: 5px; vertical-align: middle; border: 1px solid rgb(126, 140, 141); width: 100%;">Short Cell</td>
		</tr>
	</tbody>
</table>

[ericbf]

Hello is anyone going to triage this one?

[grewn0uille]

Hi,

According to the specification :

The minimum height of a row is the maximum of:

• the computed height (if definite, percentages being considered 0px) of its corresponding table-row (if nay)
• the computed height of each cell spanning the current row exclu
• the minimum height (ROWMIN) required by the cells spanning the row.

So the height of the third tr should be at least 10px (sum of paddings) + line height.
It’s indeed a bug 🐛