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Test Info:

<head>
<style>
.container {
height: 1em;
}
.overflow {
height: 8em;
}
body {
font-family: monospace;
height: 8em;
line-height: 1em;
column-count: 2;
column-gap: 0;
}
</style>
<script>
function boom()
{
document.documentElement.offsetHeight;
document.getElementById('x').style.display = 'none';
document.documentElement.offsetHeight;
document.getElementById('y').style.display = 'none';
}
</script>
</head>
<body style="width: 17ch;" onload="boom();"><div id="x" class="container"></div>This paragraph must be in the first column.<div class="container" id="y"><div class="overflow"></div></div></body>
</html>