position-sticky-fixed-ancestor.html

<!DOCTYPE html>
<html class='reftest-wait'>
<title>Sticky elements inside fixed ancestors shouldn't account for scroll</title>
<link rel="match" href="position-sticky-fixed-ancestor-ref.html" />
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<link rel="help" href="https://crbug.com/1019142">
<meta name="assert" content="This test checks that a sticky element inside a fixed subtree doesn't scroll with the viewport "/>

<script src="/common/reftest-wait.js"></script>
<script src="../resources/ref-rectangle.js"></script>


<style>
  body,html {
    margin: 0;
    width: 100%;
    height: 100%;
  }

  .sticky {
    background: green;
    position: sticky;
    bottom: 50vh;
    width: 100px;
    height: 10%;
  }

  .spacer {
    height: 90%;
  }
  .long {
    height: 600vh;
  }

  .position-parent {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    top: 100vh;
    background-color: lightgrey;
  }

  .container {
    width: 100px;
    height: 100%;
    background-color: grey;
  }

  button {
    position: fixed;
    left: 20px;
    top: 20px;
  }

  .fixed {
    position: fixed;
    top: 25vh;
  }
</style>

<div>You should see a green box below. No blue should be visible.</div>
<div class="position-parent">
  <div class="container">
    <div class="spacer"></div>
    <div class="sticky"></div>
  </div>
</div>
<div class="long"></div>
<button id="button">Toggle Fixed</button>
<script>
  function toggleFixed() {
    document.querySelector('.position-parent').classList.toggle('fixed');
  }

  document.getElementById('button').addEventListener('click', toggleFixed);

  requestAnimationFrame(() => {
    window.scrollTo(0, document.querySelector('.long').clientHeight);
    createIndicatorForStickyElements(document.querySelectorAll('.sticky'));
    requestAnimationFrame(() => {
      toggleFixed();
      takeScreenshot();
    });
  });
</script>
</html>
chromium/third_party/blink/web_tests/external/wpt/css/css-position/sticky/position-sticky-fixed-ancestor.html
