<!DOCTYPE html>
<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
<link rel="help"
  href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-direction-column">
<link rel="help" href="https://webkit.org/b/226522">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name="assert"
  content="Column flexboxes with indefinite heights don't mess up positioning of descendant grid items.">

<style>
  #reference-overlapped-red {
    position: absolute;
    background-color: red;
    width: 100px;
    height: 100px;
    z-index: -1;
  }

</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.
</p>
<div id=reference-overlapped-red></div>

<body style="height: 400px;">
  <div style="display: flex; flex-direction: column;">
    <div style="display: grid; align-items: center; height: 100%;">
      <div style="width:100px; height: 100px; background: green;"></div>
    </div>
  </div>
</body>
