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position-sticky-table-th-top.html
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<!DOCTYPE html>
<title>position:sticky top constraint should behave correctly for <th> elements</title>
<link rel="match" href="position-sticky-table-th-top-ref.html" />
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<meta name="assert" content="This test checks that the position:sticky top constraint behaves correctly for <th> elements" />
<style>
table {
border-collapse:collapse;
}
td, th {
padding: 0;
}
td > div, th > div {
height: 50px;
width: 50px;
}
.group {
display: inline-block;
position: relative;
width: 150px;
height: 200px;
}
.scroller {
position: relative;
width: 100px;
height: 150px;
overflow-x: hidden;
overflow-y: auto;
}
.prepadding {
height: 100px;
}
.postpadding {
height: 250px;
}
.indicator {
position: absolute;
background-color: red;
left: 0;
height: 50px;
width: 50px;
}
.sticky {
position: sticky;
top: 25px;
background-color: green;
}
</style>
<script>
window.addEventListener('load', function() {
document.getElementById('scroller1').scrollTop = 50;
document.getElementById('scroller2').scrollTop = 125;
document.getElementById('scroller3').scrollTop = 250;
});
</script>
<div class="group">
<div id="scroller1" class="scroller">
<div class="indicator" style="top: 100px;"></div>
<div class="prepadding"></div>
<table>
<thead>
<tr>
<th class="sticky"><div></div></th>
</tr>
</thead>
<tbody>
<tr><td><div></div></td></tr>
<tr><td><div></div></td></tr>
<tr><td><div></div></td></tr>
</tbody>
</table>
<div class="postpadding"></div>
</div>
</div>
<div class="group">
<div id="scroller2" class="scroller">
<div class="indicator" style="top: 150px;"></div>
<div class="prepadding"></div>
<table>
<thead>
<tr>
<th class="sticky"><div></div></th>
</tr>
</thead>
<tbody>
<tr><td><div></div></td></tr>
<tr><td><div></div></td></tr>
<tr><td><div></div></td></tr>
</tbody>
</table>
<div class="postpadding"></div>
</div>
</div>
<div class="group">
<div id="scroller3" class="scroller">
<div class="indicator" style="top: 250px;"></div>
<div class="prepadding"></div>
<table>
<thead>
<tr>
<th class="sticky"><div></div></th>
</tr>
</thead>
<tbody>
<tr><td><div></div></td></tr>
<tr><td><div></div></td></tr>
<tr><td><div></div></td></tr>
</tbody>
</table>
<div class="postpadding"></div>
</div>
</div>
<div>You should see three green boxes above. No red should be visible.</div>