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Test Info:

<!DOCTYPE html>
<link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
<link rel="help" href="https://www.w3.org/TR/css-break-3/">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<style>
.col {
column-width: 100px;
column-rule: 100px solid red;
height: 100px;
column-fill: auto;
gap: 0;
overflow: hidden;
}
.col > div {
display: flow-root;
width: 100px;
height: 100px;
background: green;
}
.col > div > div {
width: 10px;
height: 10px;
margin-top: 80px;
margin-left: 50px;
outline: 30px solid green;
box-shadow: 0 30px 0 30px green;
}
</style>
<body>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="col"><div><div></div></div></div>
</body>