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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/navigation/resources/root-element-transition-no-opt-in.html 

<!DOCTYPE html>
<html class="reftest-wait">
<title>View transitions: basic cross-document navigation (new page)</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="root-element-transition-no-opt-in-ref.html">
<script src="/common/reftest-wait.js"></script>
<script>
onload = takeScreenshot;
</script>
<style>
html {
  background: grey;
}
.hidden {
  width: 10px;
  height: 10px;
  view-transition-name: hidden;
  background: green;
  contain: layout;
}
html::view-transition-group(hidden) { animation-duration: 300s; }
html::view-transition-image-pair(hidden) { animation: unset; opacity: 0; }
html::view-transition-new(*), html::view-transition-old(*) {
  opacity: 1;
  animation: unset;
}
html::view-transition-old(root) {
  width: 50vw;
  height: 100vh;
  position: fixed;
  left: 0px;
  top: 0px;
}
html::view-transition-new(root) {
  width: 50vw;
  height: 100vh;
  position: fixed;
  left: 50vw;
  top: 0px;
  opacity: 1;
}
</style>
<div class="hidden"></div>
</html>