Borders not shown in Firefox with border-collapse on table, position: relative on tbody, or background-color on cell
This looks like a Firefox bug to me. The backgrounds are painting over the borders; you can see it if you use a translucent background color.
I filed https://bugzilla.mozilla.org/show_bug.cgi?id=688556
Collapsed borders covered by background in Firefox, if surrounded by inline-block and table with caption
Try using the isolation css property. This will isolate each table and may fix your problem.
The isolation CSS property determines whether an element must create a new stacking context. MDN documentation
table {
border-collapse: collapse;
margin: 0;
isolation: isolate; /* added */
}
table {
border-collapse: collapse;
margin: 0;
isolation: isolate;
}
table td {
padding: 10px;
}
caption {
font-weight: bold;
}
table.inner>tbody>tr>td {
border: 3px solid red;
background-color: rgba(255, 165, 0, 0.9);
}
table.inner>caption {
color: red;
}
div {
display: inline-block;
border: 2px dotted red;
padding: 20px;
}
table.outer {
margin-top: 20px;
}
table.outer>tbody>tr>td {
border: 3px solid blue;
}
table.outer>caption {
color: blue;
}<table class="outer">
<tr>
<td>outer table without caption</td>
</tr>
<tr>
<td>
<div>
<table class="inner">
<caption>
inner
</caption>
<tr>
<td>a</td>
<td>b</td>
</tr>
<tr>
<td>c</td>
<td>d</td>
</tr>
</table>
</div>
</td>
</tr>
<tr></tr>
</table>
<table class="outer">
<caption>
outer
</caption>
<tr>
<td>outer table with caption</td>
</tr>
<tr>
<td>
<div>
<table class="inner">
<caption class="inner">
inner
</caption>
<tr>
<td>a</td>
<td>b</td>
</tr>
<tr>
<td>c</td>
<td>d</td>
</tr>
</table>
</div>
</td>
</tr>
<tr></tr>
</table>Why is Firefox missing the border on some HTML tables
Maybe you've zoomed in/out a bit. This can happen either accidently or knowingly when you do Ctrl+Scrollwheel. Maybe it isn't completely resetted to zoom level zero. This mis-rendering behaviour is then recognizeable at some websites, also here at SO.
To fix this, just hit Ctrl+0 or do View > Zoom > Reset to reset the zoom level to default.
This is Firefox/Gecko bug 410959. This affects tables with border-collapse:collapse. It's from 2008 and there's no real progress on it, so you'll probably need to find a workaround. One way is using border-collapse:separate and fiddling with borders on a per-cell basis.
CSS/Firefox - How can I get table cell borders to show up when printing more than one page?
I don't know if there's a solution, but if you don't really need border-collapse: collapse, here's a workaround. Draw the borders that you need to draw explicitly.
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="utf-8"/>
<style type="text/css">
table {
border-spacing:0;
}
td, th {
border-right:1px solid black;
border-bottom:1px solid black;
}
thead th {
border-top:1px solid black;
}
th:first-child, td:first-child {
border-left:1px solid black;
}
</style>
</head>
<body>
<table>
<thead>
<tr>
<th>Title</th>
<th>Type</th>
<th>Author</th>
<th>Editor</th>
<th>Year</th>
<th>ISBN</th>
<th>Revision</th>
<th>Reviewer Score</th>
<th>Last Edited By</th>
<th>Comments</th>
</tr>
</thead>
<tbody>
<tr>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
</tr>
<tr>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
</tr>
<tr>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
</tr>
<tr>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
</tr>
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<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
<td>Test</td>
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<td>Test</td>
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<td>Test</td>
<td>Test</td>
</tr>
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<td>Test</td>
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</tr>
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</tr>
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</tr>
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<td>Test</td>
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<td>Test</td>
</tr>
<tr>
<td>Test</td>
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<td>Test</td>
<td>Test</td>
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<td>Test</td>
<td>Test</td>
<td>Test</td>
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<td>Test</td>
</tr>
<tr>
<td>Test</td>
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<td>Test</td>
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</tr>
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<td>Test</td>
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</tr>
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</tr>
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</tr>
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<td>Test</td>
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