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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 {
padding: 5px 0;
border-block: 10px solid green;
box-decoration-break: clone;
block-size: calc(70px + 10px); /* 1st column + 2nd column */
background: green;
}
</style>
<!-- The container's content-box block-size is 80px, making its border-box
block-size in the second column be 40px. The remaining 60px block-size in
the second column should be filled completely by the later sibling green
block. -->
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="multicol">
<div class="container"></div>
<div style="block-size: 60px; background: green"></div>
</div>