css/css-flexbox/overflow-auto-008.html

<!DOCTYPE html>
<html>
<title>CSS Flexbox: adding scrollbars with overflow: auto and flex-direction: column.</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#overflow-properties">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-direction-property">
<link rel="help" href="https://crbug.com/512229">
<meta name="assert" content="This test checks that, when a block inside a flexbox with flex-direction: column adds horizontal scrollbars due to overflow, the parent flexbox is still able to render its contents without overflowing."/>

<style>
.vflex {
  display: flex;
  flex-direction: column;
  max-width: 200px;
  margin: 10px 0 10px 0;
}

.hbox {
  overflow-x: auto;
  white-space: nowrap;
}

.rect {
  min-height: 100px;
  min-width: 100px;
  background-color: green;
  display: inline-block;
}
</style>

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<body>

<div class="vflex">
  <div class="hbox">
    <div class="rect"></div>
    <div class="rect"></div>
  </div>
</div>

<script>
var hbox = document.querySelector('.hbox');
test(function() {
  assert_equals(hbox.parentNode.clientHeight, hbox.parentNode.scrollHeight);
  assert_equals(hbox.clientHeight, hbox.scrollHeight);
}, 'hbox dimensions');
</script>
</body>
</html>