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<!DOCTYPE html>
<html>
<body>
<style>
.scroller {
width: 200px;
height: 200px;
position: relative;
border: solid;
scroll-marker-group: after;
overflow: scroll;
}
.scroll_marker_group {
height: 100px;
width: 200px;
border: solid;
white-space: nowrap;
display: grid;
grid-auto-flow: column;
}
.vwm {
writing-mode: vertical-lr;
}
.box {
position: absolute;
height: 50px;
width: 50px;
font-size: 50px;
background-color: blue;
}
.current {
border: solid blue;
}
.scroll_marker {
height: 40px;
width: 40px;
font-size: 20px;
display: inline-block;
}
.top_right {
top: 0px;
left: 100px;
&>scroll_marker {
background-color: teal;
}
}
.bottom_left {
top: 100px;
left: 0px;
}
.tr.scroll_marker {
background-color: teal;
}
.bl.scroll_marker {
background-color: brown;
}
.space {
height: 800px;
width: 800px;
position: absolute;
}
</style>
<div>
<div class="scroller">
<div class="space"></div>
<div class="top_right box">TR</div>
<div class="bottom_left box">BL</div>
</div>
<div class="scroll_marker_group">
<div class="current tr scroll_marker"></div>
<div class="bl scroll_marker"></div>
</div>
<div class="vwm scroller">
<div class="space"></div>
<div class="top_right box">TR</div>
<div class="bottom_left box">BL</div>
</div>
<div class="vwm scroll_marker_group">
<div class="tr scroll_marker"></div>
<div class="bl current scroll_marker"></div>
</div>
</div>
</body>
</html>
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