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Test Info:

<!DOCTYPE html>
<style>
.target {
display: flex;
position: relative;
line-height: 0;
writing-mode: vertical-lr;
}
.target > div {
background: hotpink;
font-size: 30px;
}
fieldset {
padding: 10px;
border: solid 10px;
margin: 0;
font-size: 20px;
}
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 > *')">
<div class="target" style="align-items: first baseline;">
<div data-offset-x="25"><span></span></div>
<fieldset data-offset-x="0">
<legend><span></span></legend>
<span></span><br><span></span>
</table>
</div>
<div class="target" style="align-items: last baseline;">
<div data-offset-x="45"><span></span></div>
<fieldset data-offset-x="0">
<span></span><br><span></span>
<legend><span></span></legend>
</table>
</div>