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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/fragmented-at-start-ignored.html 

<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: fragmented elements skipped</title>
<link rel="help" href="https://www.w3.org/TR/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="fragmented-at-start-ignored-ref.html">

<script src="/common/reftest-wait.js"></script>
<style>
#spacer {
  width: 100px;
  height: 950px;
  background: lightgreen;
}
#container {
  width: 500px;
  columns: 2;
  height: 500px;
}
#target {
  width: 200px;
  height: 200px;
  background: green;
  view-transition-name: target;
}
#unrelated {
  width: 100px;
  height: 100px;
  background: lightblue;
  view-transition-name: unrelated;
}

::view-transition {
  background: pink;
}
::view-transition-group(root) {
  animation-duration: 500s;
  visibility: hidden;
}
::view-transition-group(target) {
  border: 1px solid black;
}
</style>
<div id=container>
  <div id=spacer></div>
  <div id=target></div>
</div>
<div id=unrelated></div>

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

function runTransition() {
  document.startViewTransition().ready.then(takeScreenshot);
}

requestAnimationFrame(() => requestAnimationFrame(runTransition))
</script>