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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/content-smaller-than-box-size.html 

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

<script src="/common/reftest-wait.js"></script>
<style>
div { contain: paint; }
#target {
  width: 100px;
  height: 100px;
  view-transition-name: target;
}
#inner {
  width: 10px;
  height: 10px;
  background: blue;
  position: relative;
  top: 10px;
  left: 10px;
}

.hidden {
  background: pink;
  width: 10px;
  height: 10px;
  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-new(target) { animation: unset; opacity: 0; }
html::view-transition-old(target) { animation: unset; opacity: 1; }

</style>

<div id=target>
  <div id=inner></div>
</div>
<div id=hidden class=hidden></div>

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

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