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<!DOCTYPE html>
<title>position:sticky elements should properly interact with margins</title>
<link rel="match" href="position-sticky-margins-ref.html" />
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<meta name="assert" content="position:sticky elements should ignore margins when sticking, but consider them when making sure sticky elements do not escape their containing block" />
<style>
.group {
display: inline-block;
position: relative;
width: 180px;
height: 400px;
}
.scroller {
position: relative;
width: 150px;
height: 300px;
overflow-y: scroll;
overflow-x: hidden;
}
.holder {
width: 130px;
height: 200px;
}
.sticky {
position: sticky;
background-color: green;
top: 5px;
margin: 15px;
}
.indicator {
left: 15px;
position: absolute;
background-color: red;
}
.box {
width: 100px;
height: 100px;
}
.padding {
height: 300px;
}
</style>
<script>
window.addEventListener('load', function() {
document.getElementById('scroller1').scrollTop = 0;
document.getElementById('scroller2').scrollTop = 60;
document.getElementById('scroller3').scrollTop = 120;
});
</script>
<!-- Before sticking, the margin should be obeyed. -->
<div class="group">
<div id="scroller1" class="scroller">
<div class="indicator box" style="top: 15px;"></div>
<div class="holder">
<div class="sticky box"></div>
</div>
<div class="padding"></div>
</div>
</div>
<!-- Whilst stuck, the margin is irrelevant. -->
<div class="group">
<div id="scroller2" class="scroller">
<div class="indicator box" style="top: 65px;"></div>
<div class="holder">
<div class="sticky box"></div>
</div>
<div class="padding"></div>
</div>
</div>
<!-- The margin does count when making sure the sticky element does not escape
its containing block. -->
<div class="group">
<div id="scroller3" class="scroller">
<div class="indicator box" style="top: 100px;"></div>
<div class="holder">
<div class="sticky box"></div>
</div>
<div class="padding"></div>
</div>
</div>
<div>You should see three green boxes above. No red should be visible.</div>
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