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

<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: object-view-box</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="object-view-box-ref.html">

<script src="/common/reftest-wait.js"></script>
<style>
.target {
  contain: paint;
  width: 100px;
  height: 100px;
  transform: scale(2.0, 3.0);
  position: relative;
  top: 200px;
  left: 200px;
  view-transition-name: target;
}

.embedded {
  width: 100%;
  height: 50%;
}

.hidden {
  contain: paint;
  width: 10px;
  height: 10px;
  background: grey;
  view-transition-name: hidden;
}

html::view-transition-group(hidden) { animation-duration: 300s; }
html::view-transition-image-pair(hidden) { animation: unset; opacity: 0; }

html::view-transition-old(target) {
  animation: unset;
  opacity: 0;
  height: 100%;
}
html::view-transition-new(target) {
  animation: unset;
  opacity: 1;
  object-view-box: inset(50px 0px 0px 0px);
  object-fit: none;
  object-position: 0% 0%;
  height: 100%;
  contain: paint;
}

</style>

<div id="target" class="target">
  <div class="embedded" style="background: green;"></div>
  <div class="embedded" style="background: blue">SharedElement</div>
</div>
<div id=hidden class=hidden></div>

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

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