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<!DOCTYPE html>
<title>Anchored element should update when the nearest scroll container under `contain: layout size` element changes.</title>
<style>
.anchor {
width: 20px;
height: 20px;
background: magenta;
}
.positioned {
background: purple;
width: 20px;
height: 20px;
}
.flex {
display: flex;
}
.abs-cb {
position: relative;
width: 200px;
height: 200px;
border: 1px solid;
}
.scroll {
overflow: scroll;
}
.outer {
width: 200px;
height: 200px;
}
.inner {
width: 150px;
height: 150px;
}
.filler {
width: 1px;
height: 200px;
}
</style>
<div class=abs-cb>
<div id=outer class="scroll outer">
<div class=filler></div>
<div class=flex>
<div class=anchor></div>
<div class=positioned></div>
</div>
<div class=inner>
<div class=anchor></div>
</div>
</div>
</div>
<script>
outer.scrollTop = 100;
</script>