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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<style>
.multicol {
column-count: 2;
column-gap: 0;
column-fill: auto;
width: 200px;
border: 5px solid gray;
height: 0px;
}
.flexbox {
position: relative
}
.flexbox > div {
position: absolute;
width: 50px;
contain: size;
}
</style>
<div class="multicol">
<div class="flexbox">
<div style="height: 10px; background: pink; left: 100px;"></div>
<div style="height: 20px; background: orange; left: 50px;"></div>
</div>
</div>
</html>