<!DOCTYPE html>
<html>
  <meta charset="utf-8">
  <title>CSS Position Test: Test position:sticky element with large top in an overflow container</title>
  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
  <link rel="help" href="https://drafts.csswg.org/css-position/#sticky-pos">
  <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1598112">
  <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/2794">
  <link rel="match" href="position-sticky-large-top-ref.html">
  <meta name="assert" content="This test verifies the position of a position:sticky element with large top value can be reached by scrolling the overflow container.">

  <style>
  .scroll {
    border: 5px solid blue;
    overflow: auto;
    height: 200px;
    width: 200px;
  }

  .block {
    width: 100%;
    height: 200px;
    background: yellow;
  }

  .sticky {
    position: sticky;
    background: purple;
    width: 50px;
    height: 50px;
    top: 200px;
  }
  </style>
  <script>
  function runTest() {
    document.getElementById("scroll2").scrollTop = 50;
  }
  </script>

  <body onload="runTest();">
    <!-- test before scroll -->
    <div class="scroll">
      <div class="sticky"></div>
      <div class="block"></div>
    </div>

    <!-- test after scroll -->
    <div class="scroll" id="scroll2">
      <div class="sticky"></div>
      <div class="block"></div>
    </div>
  </body>
</html>
