<!DOCTYPE html>
<title>Multicolumn under position:sticky should be positioned correctly</title>
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<link rel="match" href="position-sticky-child-multicolumn-ref.html" />
<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org" />
<meta name="assert" content="This test checks that a multicolumn element is positioned relative to a sticky position" />

<style>
  body {
    margin: 0;
  }
  #scroller {
    overflow-y: scroll;
    width: 200px;
    height: 200px;
  }
  #sticky {
    position: sticky;
    top: 10px;
    margin: 10px;
  }
  #multicolumn {
    width: 100px;
    height: 100px;
    background: green;
    columns: 1;
  }
  #contents {
    margin-left: 10%;
    margin-top: 10%;
    width: 80%;
    height: 80%;
    background: lightgreen;
  }
  #spacer {
    height: 400px;
  }
</style>

<div id="scroller">
  <div id="sticky">
    <div id="multicolumn">
      <div id="contents"></div>
    </div>
  </div>
  <div id="spacer"></div>
</div>

<div>You should see a light green box above with a dark green border.</div>

<script>
  window.addEventListener('load', function() {
    scroller.scrollTop = 100;
  });
</script>