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<!DOCTYPE html>
<title>CSS Reference File: ::scroll-marker-group before the scroller</title>
<style>
#row {
display: flex;
}
#scroller, #marker {
width: 50px;
height: 50px;
}
#scroller {
background: blue;
}
#marker {
background: green;
}
</style>
<p>Test passes if there is a blue square with a green square to the right of it.</p>
<div id="row">
<div id="scroller"></div>
<div id="marker"></div>
</div>