css/css-flexbox/align-items-baseline-vert-lr-column-horz-flexbox-item.html

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-align-3/#baseline-rules">
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#cross-alignment">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<link rel="author" href="mailto:sammy.gill@apple.com" title="Sammy Gill">
<style>
#target {
  display: flex;
  flex-direction: column;
  writing-mode: vertical-lr;
  align-items: baseline;
  border: 3px solid black;
  font-family: monospace;
  font-size: 10px;
  line-height: 10px;
}
#target > :nth-child(1) {
  background: hotpink;
  writing-mode: horizontal-tb;
  padding-left: 30px;
  margin-left: 10px;
}
#target > :nth-child(2) {
  background: papayawhip;
  writing-mode: horizontal-tb;
}
.inner {
    display: flex;
    border: 5px solid black;
    padding: 5px;
}
</style>
<body onload="checkLayout('#target > div')">
<div id="target">
  <div class="inner" data-offset-y="11">
    <div>two<br>lines</div>
  </div>
  <div data-offset-y="21">hello</div>
</div>
</body>