<!DOCTYPE html>
<meta name="timeout" content="long">
<html class=reftest-wait>
<title>View transitions: incoming viewport has scrollbars</title>
<link rel="help" href="https://github.com/WICG/view-transitions">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/7859">
<link rel="author" href="mailto:bokan@chromium.org">
<link rel="match" href="new-content-has-scrollbars-ref.html">
<meta name=fuzzy content="new-content-has-scrollbars-ref.html:0-40;0-30000">
<script src="/common/reftest-wait.js"></script>
<style>
  html, body {
    width: 100%;
    height: 100%;
    background-color: lightpink;
  }
  html {
    overflow: hidden;
  }
  body {
    /* Margin to make sure background color is correctly drawn into the snapshot. */
    margin: 50px;
  }
  div {
    /* Draw a checkerboard pattern to make sure the snapshot is captured at the
     * full size, rather than scaled. */
    background-image:
      linear-gradient(45deg, #000 25%, transparent 25%),
      linear-gradient(45deg, transparent 75%, #000 75%),
      linear-gradient(45deg, transparent 75%, #000 75%),
      linear-gradient(45deg, #000 25%, lightgreen 25%);
    background-size: 200px 200px;
    background-position: 0 0, 0 0, -100px -100px, 100px 100px;
    width: 200%;
    height: 200%;
  }

  /* We're verifying what we capture, so just display the old contents for 5 minutes.  */
  html::view-transition-new(root) { animation: unset; opacity: 0; }
  html::view-transition-old(root) {
    animation-duration: 300s;
    animation-timing-function: steps(1, end);
    opacity: 1;
  }
</style>

<div></div>
<script>
failIfNot(document.startViewTransition, "Missing document.startViewTransition");

// Ensure a root snapshot captured in the absence of scrollbars is displayed at
// full size when rendered in the incoming viewport which is inset by
// scrollbars. The content must not be scaled-to-fit.
async function runTest() {
  document.startViewTransition(() => {
    document.documentElement.style.overflow = "unset";
    requestAnimationFrame(() => requestAnimationFrame(takeScreenshot));
  });
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>

