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<!doctype html>
<meta charset="utf-8">
<title>CSS Reference File: ::scroll-marker with ::scroll-marker-group before</title>
<style>
#scroller {
width: 600px;
height: 300px;
overflow: scroll;
}
#scroller div {
width: 600px;
height: 300px;
margin-bottom: 20px;
background: green;
}
#scroll-marker-group {
border: 3px solid black;
padding: 5px;
display: flex;
}
#scroll-marker-group>span {
width: 10px;
height: 10px;
background-color: blue;
border-radius: 100%;
}
#scroll-marker-group>#first {
background-color: purple;
margin-right: 4px;
}
</style>
<div id="scroll-marker-group">
<span id="first"></span>
<span></span>
</div>
<div id="scroller">
<div></div>
<div></div>
</div>