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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/fractional-box-old.html 

<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: fractional box -- old content</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="fractional-box-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
.box {
  margin: 15px;
  background: green;
  width: 100.125px;
  height: 50.875px;
}
.shift {
  position: relative;
  left: 0.4px;
}
html::view-transition-group(*) { animation-duration: 300s; }
html::view-transition-new(*) { animation: unset; opacity: 0; }
html::view-transition-old(*) { animation: unset; opacity: 1; }
html::view-transition-group(root) { animation: unset; opacity: 0; }
html::view-transition { background: lightpink; }
</style>
<div class="box" style="view-transition-name: one"></div>
<div class="box shift" style="view-transition-name: two"></div>
<script>
failIfNot(document.startViewTransition, "Missing document.startViewTransition");

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