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<!DOCTYPE html>
<style>
#scroller {
columns: 2;
column-fill: auto;
padding: 0;
gap: 0;
width: 400px;
height: 100px;
}
#scroller::scroll-marker-group {
display: flex;
height: 200px;
background: gray;
}
#scroller>div::scroll-marker {
display: block;
width: 25px;
height: 50%;
content: "";
background: yellow;
}
fieldset {
border: 3px solid black;
}
</style>
<p>There should be a yellow square inside a gray box below, and below that, a
fieldset with a legend. The text "first" and "second" should be seen
inside.</p>
<div style="height:200px; background:gray;">
<div style="width:100px; height:100px; background:yellow;"></div>
</div>
<fieldset id="scroller">
<legend>Legend</legend>
<div style="break-before:column;">first</div>
<div style="break-before:column;">second</div>
</fieldset>