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<!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/">
<style>
.multicol {
width: 150px;
height: 50px;
columns: 2;
column-gap: 0;
column-fill: auto;
border: 3px solid black;
margin: 10px;
}
.outer {
width: 50px;
height: 100px;
background: green;
}
</style>
<p>This test passes if there are two 50x50 green squares in each black box.</p>
<div class="multicol">
<div class="outer"></div>
</div>
<div class="multicol">
<div class="outer"></div>
</div>