chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/new-content-object-view-box-overflow-clipped.html

<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: object-view-box with larger overflow</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="new-content-object-view-box-overflow-clipped-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
.target {
  color: red;
  width: 100px;
  height: 100px;
  contain: paint;
  overflow-clip-margin: 10px;
  position: relative;
  top: 50px;
  left: 50px;
  view-transition-name: target;
}
.child {
  width: 123px;
  height: 150px;
  background: lightblue;
  position: relative;
  top: -10px;
  left: -20px;
}
.grandchild {
  width: 25px;
  height: 25px;
  position: relative;
  top: 20px;
  left: 40px;
  background: green;
}

html::view-transition-group(target) { animation-duration: 300s; }
html::view-transition-new(target) {
  animation: unset;
  opacity: 1;

  /* clip overflow, and verify inner contents only */
  overflow: hidden;
  height: 100%;
}
html::view-transition-old(target) { animation: unset; opacity: 0; height: 100%; }

html::view-transition-group(root) { animation: unset; opacity: 0; }
html::view-transition { background: lightpink; }
</style>

<div class=target>
  <div class=child>
    <div class=grandchild></div>
  </div>
</div>

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

async function runTest() {
  document.startViewTransition(() =>
    requestAnimationFrame(() => requestAnimationFrame(takeScreenshot)));
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>