<!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>
