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Test Info:

<!DOCTYPE HTML>
<title>Test for dynamic re-pagination of absolutely positioned elements</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<style>
#multicol {
columns: 3;
column-fill: auto;
column-gap: 15px;
height: 150px;
width: 300px;
background: yellow;
}
#relpos {
position: relative;
background: aqua;
height: 250px;
}
#abspos {
position: absolute;
top: 80px;
right: 0;
height: 80px;
width: 50px;
background: blue;
}
</style>
<div id="multicol">
<div id="relpos">
<div id="abspos"></div>
</div>
</div>
<script>
var mc = document.getElementById("multicol");
mc.offsetHeight; // flush layout
mc.style.height = "auto";
</script>