css/css-flexbox/flexbox-definite-sizes-001.html

<!doctype html>
<meta charset="utf-8">
<title>CSS Test: nested flex containers with height established by 'min-height'</title>
<link rel="match" href="flexbox-definite-sizes-001-ref.html">
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#definite-sizes">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1449326">
<style>
div {
  display: flex;
}

.item {
  width: 100px;
  background: red;
  align-items: center;
}

.item span {
  min-height: 100%;
  width: 100%;
  background: green;
}
</style>
<p>Test passes if you see a green 100px x 100px square, and no red</p>
<div style="min-height: 100px;">
  <div class="item">
    <span></span>
  </div>
</div>