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<!DOCTYPE html>
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/7639">
<style>
.target {
display: flex;
inline-size: 200px;
position: relative;
line-height: 0;
margin: 40px;
padding: 10px;
writing-mode: vertical-rl;
}
.target > div {
background: hotpink;
font-size: 20px;
}
.multicol {
columns: 3;
column-fill: auto;
padding: 10px;
border: solid 10px;
}
.multicol > div {
break-inside: avoid;
break-before: column;
break-after: column;
}
span {
display: inline-block;
width: 1em;
height: 1em;
outline: solid cyan 3px;
outline-offset: -3px;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="checkLayout('.target > *')">
<!-- Three columns, largest in the middle. -->
<div class="target" style="align-items: first baseline;">
<div data-offset-x="105"><span></span></div>
<div class="multicol" data-offset-x="10">
<div style="font-size: 10px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 30px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 20px;">
<span></span><br><span></span><br><span></span>
</div>
</div>
</div>
<div class="target" style="align-items: last baseline;">
<div data-offset-x="35"><span></span></div>
<div class="multicol" data-offset-x="10">
<div style="font-size: 10px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 30px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 20px;">
<span></span><br><span></span><br><span></span>
</div>
</div>
</div>
<!-- Start spanning element. -->
<div class="target" style="align-items: first baseline;">
<div data-offset-x="140"><span></span></div>
<div class="multicol" data-offset-x="10">
<div style="column-span: all; background: orange;">
<span></span><br><span></span>
</div>
<div style="font-size: 10px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 30px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 20px;">
<span></span><br><span></span><br><span></span>
</div>
</div>
</div>
<div class="target" style="align-items: last baseline;">
<div data-offset-x="35"><span></span></div>
<div class="multicol" data-offset-x="10">
<div style="column-span: all; background: orange;">
<span></span><br><span></span>
</div>
<div style="font-size: 10px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 30px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 20px;">
<span></span><br><span></span><br><span></span>
</div>
</div>
</div>
<!-- End spanning element. -->
<div class="target" style="align-items: first baseline;">
<div data-offset-x="145"><span></span></div>
<div class="multicol" data-offset-x="10">
<div style="font-size: 10px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 30px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 20px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="column-span: all; background: orange;">
<span></span><br><span></span>
</div>
</div>
</div>
<div class="target" style="align-items: last baseline;">
<div data-offset-x="30"><span></span></div>
<div class="multicol" data-offset-x="10">
<div style="font-size: 10px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 30px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="font-size: 20px;">
<span></span><br><span></span><br><span></span>
</div>
<div style="column-span: all; background: orange;">
<span></span><br><span></span>
</div>
</div>
</div>
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