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<!DOCTYPE html>
<style>
#scroller {
height: 100px;
}
#scroller::scroll-marker-group {
display: flex;
height: 100px;
background: gray;
}
#scroller>div::scroll-marker {
display: block;
width: 25px;
height: 100%;
content: "";
background: yellow;
}
</style>
<p>There should be a yellow square inside a gray box below, and below that, a
fieldset with a legend.</p>
<div style="height:200px; background:gray;">
<div style="width:100px; height:100px; background:yellow;"></div>
</div>
<fieldset id="scroller">
<legend>Legend</legend>
first
</fieldset>