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chromium/third_party/blink/web_tests/fast/sub-pixel/column-clipping.html 

<!DOCTYPE html>
<html>
<style>
body > div {
	column-count: 2;
	width: 51px;
	position: absolute;
	left: 0px;
	top: 0px;
}
div > div {
	width: 10px;
	height: 10px;
	background-color: green;
	border: 1px solid black;
	position: relative;
}
</style>
<body>
<div>
	<div></div>
	<div></div>
</div>
</body>