css/css-flexbox/orthogonal-writing-modes-and-intrinsic-sizing.html

<!DOCTYPE html>
<html>
<title>CSS Flexbox: main size on orthogonal flex item.</title>
<link rel="stylesheet" href="support/flexbox.css" >
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-base-size">
<link rel="issue" href="https://codereview.chromium.org/1052363002">
<meta name="assert" content="This test ensure the correct main sizes are used when flex item is orthogonal to the flex container."/>
<style>
.flexbox {
  background-color: gray;
}

.vertical {
  writing-mode: vertical-lr;
  width: min-content;
  background-color: 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('.flexbox')">
<div id=log></div>

<div class="flexbox" data-expected-height="20">
  <div class="vertical" data-expected-width="50" data-expected-height="20">
    <div style="width: 50px; height: 20px; background-color: blue;" data-expected-width="50" data-expected-height="20"></div>
  </div>
</div>

<div class="flexbox column" data-expected-height="20">
  <div class="vertical" data-expected-width="50" data-expected-height="20">
    <div style="width: 50px; height: 20px; background-color: blue;" data-expected-width="50" data-expected-height="20"></div>
  </div>
</div>