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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<script>
function tweak() {
var b = document.getElementsByTagName("span")[0];
b.remove();
document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate", tweak);
</script>
</head>
<body>
<div style="column-count: 2;
height: 50px;
width: 100px;
background: yellow">
<span>0 1 2 3 4 5 6 7 8 9 0</span>a
</div>
</body>
</html>