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chromium/third_party/blink/web_tests/wpt_internal/css/css-overflow/scroll-marker-001-ref.html 

<!doctype html>
<meta charset="utf-8">
<title>CSS Reference File: ::scroll-marker with ::scroll-marker-group after</title>
<link rel="author" href="mailto:[email protected]">
<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;
    }

    #scroll-marker-group > div {
        width: 10px;
        height: 10px;
        background-color: blue;
        border-radius: 100%;
    }

    #scroll-marker-group > #first {
        background-color: purple;
    }
</style>
<div id="scroller">
    <div></div>
    <div></div>
</div>
<div id="scroll-marker-group">
    <div id="first"></div>
    <div></div>
</div>