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<!DOCTYPE html>
<html>
<head>
<script>
function boom() {
document.documentElement.offsetHeight;
document.getElementById('e').setAttribute('style', '');
document.documentElement.offsetHeight;
}
</script>
<style id="e">
body #a::after { content: "before text"; position: fixed; }
</style>
</head>
<body onload="boom();" style="column-count: 2; width: 100px;">
<div>m</div>
<div id="a" style="column-count: 2;">
m
<br style="float: left;">
m
<span style="float: left;">m</span>
<div style="float: left; column-width: 9999999999px;"></div>
</div>
</body>
</html>
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