<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-flexbox/">
<link rel="match" href="empty-flex-box-and-margin-collapsing-ref.html">
<meta name="assert" content="This checks that empty flex/grid box's margins do not collapse through.">
<style>
.container {
  background: green;
  height: 50px;
  width: 100px;
}

.root {
  margin-top: 0;
  margin-bottom: 200px;
}
</style>
<p>Test passes if there is a filled green square.</p>
<div class=container>
  <div class=root style="display: flex"></div>
</div>
<div class=container>
  <div class=root style="display: grid"></div>
</div>