<!DOCTYPE html>
<style>
table {
border-collapse: collapse;
}
td, th {
}
tr {
break-inside: avoid;
}
.header {
font-weight: bold;
text-align: center
}
</style>
<p>crbug.com/620456: A nested table header group repeats on each page.</p>
<div style="-webkit-columns:3; line-height: 20px; column-fill: auto; height:190px;">
<table>
<tr><td class="header" colspan=2>Col 1</td></tr>
<tr><td>
<br>
<table>
<tr><td class="header">Col 1</td><td class="header">Col 2</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
</table>
</tr></td>
<tr><td class="header" colspan=2>Col 1</td></tr>
<tr><td style="padding-top: 0px;">
<table>
<tr><td class="header">Col 1</td><td class="header">Col 2</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
</table>
</tr></td>
<tr><td class="header" colspan=2>Col 1</td></tr>
<tr><td style="padding-top: 0px;">
<table>
<tr><td class="header">Col 1</td><td class="header">Col 2</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
<tr><td>Te</td><td>xt</td></tr>
</table>
</tr></td>
</table>
</div>