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Test Info: Warnings

<!DOCTYPE html>
<html reftest-async-scroll reftest-async-scroll-y="50">
<style>
html, body {
margin: 0;
}
thead tr {
position: sticky;
top: 0;
}
th {
position: sticky;
top: -2px;
background-color: green;
height: 20px;
}
td {
background-color: blue;
}
</style>
<body>
<table cellspacing=0>
<thead>
<tr><th></th></tr>
</thead>
<tbody>
<tr><td style="height: 2000px; vertical-align: top">table cell</td></tr>
</tbody>
</table>
</html>