Table borders disappear in default or low zoom ratio

#26441

I used css to draw table borders(source is below), and PD4ML generated PDF file was OK, and paper printed via printer was OK, too.
But when I used Adobe Acrobet Reader 9 to view pdf file genereated by PD4ML, in default zoom ratio or low ratio, some borders “disappear” !? (see attached file)
If I changed zoom ratio to greater such as 150%, those disappearances displayed again…and I noticed those borders are slimmer than others.

BTW, there’s something I noticed,
if I remove padding or background style of th/td, everything is OK
but when I use padding and background style, some borders will disappear in low zoom ratio.

PD4ML ver: 360fx1 registered and 361b1 trial

Html source:

<html>
<head>
<meta http-equiv=Content-Type content="text/html; charset=utf-8">
<style type="text/css">
.tb1a{border:1px #000 solid; border-collapse:collapse;}
.tb1a th,.tb1a td{padding:3px 3px; border:1px #000 solid;}
.tb1a th{background:#ddd;}
</style>
</head>
<body>
<table width="100%" border="0" cellpadding="0" cellspacing="0" class="tb1a">
<tr>
<th>111</th>
<th>222</th>
<th>333</th>
<th>444</th>
<th>555</th>
<th>666</th>
<th>777</th>
<th>888</th>
</tr>
<tr>
<td>aaa</td>
<td>bbb</td>
<td>ccc</td>
<td>ddd</td>
<td>eee</td>
<td>fff</td>
<td>ggg</td>
<td>hhh</td>
</tr>
</table>
</body>

#28182

I guess it happens because of coordinates rounding by particular zoom factors. So cell background overlaps borders. A workaround is to define background not to table cells, but to rows.

For example:
.tb1a tr:first-child{background:#ddd;}

#28183

But if my table layout is as below:

<style type="text/css">
.tb4{color:#000; border:1px #000 solid; border-collapse:collapse;}
.tb4 td{padding:6px 3px; border:1px #000 solid; line-height:15px; }
.tb4 .hd{padding:6px 3px; background:#eee; text-align:right; }
</style>
... ...
<table width="100%" border="0" cellpadding="0" cellspacing="0" class="tb4">
<tr>
<td class="hd" width="20%">
AAA
</td>
<td>
111
</td>
</tr>
<tr>
<td class="hd" width="20%">
BBB
</td>
<td>
222
</td>
</tr>
</table>

Any suggestion to fix “missing” border between AAA and BBB?

#28184

PD4ML table border rendering algorithms are significantly refactored by v361b2. The issue is solved.

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