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<html class="reftest-wait">
<meta name="viewport" content="width=device-width minimum-scale=0.25 initial-scale=1.0">
<style>
  html, body {
    margin: 0;
    width: 100%;
    height: 100%;
    scrollbar-width: none;
  }
  div {
    position: absolute;
  }
  .B {
    width: 200%;
    height: 400%;
    background: white;
  }
  .C {
    width: 200%;
    height: 200%;
    background: green;
  }
</style>
<div class="B"></div>
<div class="C"></div>
<script>
document.addEventListener('MozReftestInvalidate', () => {
  // The page here is twice the width of the ICB, and four times the height.
  // We want the layout viewport to be expanded to be twice the width and
  // height of the ICB (to maintain aspect ratio), rather than four times the
  // height.
  // To test this, scroll to the end of the layout scroll range.
  // If the layout viewport is expanded too much, we have no layout scroll
  // range, so nothing will happen, and a green area will remain in view.
  // If the layout viewport is expanded to the desired size, a white area
  // will be scrolled into view, matching the reference page.
  window.scrollTo(window.scrollMaxX, window.scrollMaxY);
  document.documentElement.classList.remove('reftest-wait');
});
</script>
</html>