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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/navigation/at-rule-opt-in-auto-ref.html 

<!DOCTYPE html>
<title>View Transitions: @view-transition opt in for cross-document (ref)</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<link rel="author" href="mailto:[email protected]">
<style>
.old {
  width: 50vw;
  height: 100vh;
  position: fixed;
  left: 0px;
  top: 0px;
  background: blue;
}

.new {
  width: 50vw;
  height: 100vh;
  position: fixed;
  left: 50vw;
  top: 0px;
  background: grey;
}
</style>
<div class="old"></div>
<div class="new"></div>