css/css-flexbox/flexbox-justify-content-wmvert-003.html

<!doctype html>
<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#justify-content-property" />
<link rel="help" href="https://drafts.csswg.org/css-align-3/#positional-values" />
<meta name="assert" content="Flexbox honors justify-content values when vertical row flexboxes have main axis parallel to line-left <-> line-right axis.">

<style>
.flexbox {
  display: flex;
  height: 100px;
  background: orange;
  border: 1px solid;
  margin-bottom: 20px;
  position: relative;
}

.flexitem {
  width: 50px;
  height: 50px;
  background: blue;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="checkLayout('.flexitem')">

Both should be Blue on top of Orange.
<div class=flexbox style="justify-content: left; writing-mode: vertical-rl;">
  <div class=flexitem data-offset-y=0></div>
</div>
<div class=flexbox style="justify-content: left; writing-mode: vertical-lr;">
  <div class=flexitem data-offset-y=0></div>
</div>

Both should be Orange on top of Blue.
<div class=flexbox style="justify-content: right; writing-mode: vertical-rl;">
  <div class=flexitem data-offset-y=50></div>
</div>
<div class=flexbox style="justify-content: right; writing-mode: vertical-lr;">
  <div class=flexitem data-offset-y=50></div>
</div>