servo/tests/wpt/web-platform-tests/css/css-position/position-sticky-transforms-translate.html

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HTML

<!DOCTYPE html>
<title>translations on position:sticky elements should apply after sticking</title>
<link rel="match" href="position-sticky-transforms-translate-ref.html" />
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<meta name="assert" content="This test checks that translations on position:sticky elements are carried out on their stuck position" />
<style>
.group {
display: inline-block;
position: relative;
width: 150px;
height: 250px;
}
.scroller {
position: relative;
width: 100px;
height: 200px;
overflow-x: hidden;
overflow-y: auto;
}
.contents {
height: 500px;
}
.container {
height: 150px;
}
.indicator {
background-color: red;
position: absolute;
left: 0;
}
.sticky {
background-color: green;
position: sticky;
top: 50px;
}
.box {
width: 100%;
height: 50px;
}
</style>
<script>
window.addEventListener('load', function() {
document.getElementById('scroller1').scrollTop = 50;
document.getElementById('scroller2').scrollTop = 70;
document.getElementById('scroller3').scrollTop = 50;
});
</script>
<div class="group">
<div id="scroller1" class="scroller">
<div class="indicator box" style="top: 50px;"></div>
<div class="contents">
<div class="container">
<div class="sticky box" style="transform: translateY(-100%);"></div>
</div>
</div>
</div>
</div>
<!-- The pre-transform sticky is not allowed to escape its containing block. -->
<div class="group">
<div id="scroller2" class="scroller">
<div class="indicator box" style="top: 50px;"></div>
<div class="contents">
<div class="container">
<div class="sticky box" style="transform: translateY(-100%);"></div>
</div>
</div>
</div>
</div>
<!-- The sticky element should stick before the container is transformed. -->
<div class="group">
<div id="scroller3" class="scroller">
<div class="indicator box" style="top: 200px;"></div>
<div class="contents">
<div class="container" style="transform: translateY(100px);">
<div class="sticky box"></div>
</div>
</div>
</div>
</div>
<div>You should see three green boxes above. No red should be visible.</div>