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<!DOCTYPE html>
<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
<link rel="help" href="https://crbug.com/1229458">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/8690">
<link rel="help" href="https://github.com/whatwg/html/issues/9123">
<link rel="help"
href="https://html.spec.whatwg.org/multipage/rendering.html#anonymous-fieldset-content-box">
<meta name="assert"
content="justify-content: center is ignored in a column flexbox fieldset when the anonymous fieldset content box has no height or min-height.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<style>
fieldset {
display: flex;
flex-flow: column;
justify-content: center;
align-items: center;
width: 200px;
min-height: 200px;
padding: 0px;
border: 1px solid;
position: relative;
}
.item {
height: 100px;
width: 100px;
background: orange;
}
</style>
<p>Pass Condition: orange square is at top of black square.<br>
Safari 16.4 and Firefox 111 fail -- orange box is vertically centered as if
the anonymous fieldset content box and the fieldset were the same box.
</p>
<fieldset>
<div class="item" data-offset-y="0"></div>
</fieldset>
<script>
checkLayout('.item');
</script>
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