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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Overflow: ::scroll-marker with ::scroll-marker-group doesn't propagate scroll from frame</title>
<style>
:root {
scroll-marker-group: before;
}
.item {
height: 100vh;
}
.item::scroll-marker {
content: '';
background-color: blue;
width: 20px;
height: 20px;
display: inline-block;
margin-left: 10px;
}
</style>
<div class=item></div>
<div class=item></div>
<div class=item></div>
<div class=item></div>
<div class=item></div>