testing/web-platform/tests/css/css-view-transitions/old-content-captures-root.html


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<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: capture root elements</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:vmpstr@chromium.org">
<link rel="match" href="old-content-captures-root-ref.html">
<meta name="fuzzy" content="maxDifference=0-1; totalPixels=0-500">
<script src="/common/reftest-wait.js"></script>
<style>
.box {
  background: lightblue;
  width: 100px;
  height: 100px;
  contain: paint;
  position: absolute;
  font-size: 30pt;
}
#e1 {
  top: 20px;
  left: 20px;
}
#shared {
  contain: paint;
  width: 100px;
  height: 100px;
  background: red;
  view-transition-name: shared;
}

div.dst { background: lightgreen; }
/* We're verifying what we capture, so just display the old contents for 5 minutes.  */
html::view-transition { background: pink; }
html::view-transition-group(shared) { animation-duration: 300s; }
html::view-transition-image-pair(shared) { visibility: hidden }
html::view-transition-old(root) { animation: unset; opacity: 1 }
html::view-transition-new(root) { animation: unset; opacity: 0 }
</style>
<div id=e1 class=box></div>
<div id=shared></div>
<script>
failIfNot(document.startViewTransition, "Missing document.startViewTransition");

async function runTest() {
  document.startViewTransition(() => {
    e1.classList.add("dst");
    document.body.style.background = "red";
    requestAnimationFrame(() => requestAnimationFrame(takeScreenshot));
  });
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>