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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<style>
.multicol {
column-count: 2;
column-gap: 0;
column-fill: auto;
inline-size: 100px;
block-size: 100px;
background: red;
}
.container {
border-block: 15px solid green;
box-decoration-break: clone;
block-size: calc(70px + 30px); /* 1st column + 2nd column */
}
.child {
block-size: calc(70px + 85px); /* 1st column + 2nd column */
background: green;
}
</style>
<!-- The container's content-box block-size is 100px, occupying part of the
second column. The child overflows the container, and get painted over the
container's block-end border in the second column. -->
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="multicol">
<div class="container">
<div class="child"></div>
</div>
</div>