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<!DOCTYPE html>
<title>Reference for position:sticky top constraint should behave correctly for <th> elements</title>
<style>
.group {
display: inline-block;
position: relative;
width: 150px;
height: 200px;
}
.scroller {
position: relative;
width: 100px;
height: 150px;
overflow-x: hidden;
overflow-y: auto;
}
.contents {
height: 550px;
}
.indicator {
position: absolute;
background-color: green;
left: 0;
height: 50px;
width: 50px;
}
</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="contents"></div>
</div>
</div>
<div class="group">
<div id="scroller2" class="scroller">
<div class="indicator" style="top: 150px;"></div>
<div class="contents"></div>
</div>
</div>
<div class="group">
<div id="scroller3" class="scroller">
<div class="indicator" style="top: 250px;"></div>
<div class="contents"></div>
</div>
</div>
<div>You should see three green boxes above. No red should be visible.</div>
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