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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/no-raf-while-render-blocked.html 

<!DOCTYPE html>
<meta name="timeout" content="long">
<html>
<title>View transitions: rAF is not issued while render-blocked</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
div {
  width: 100px;
  height: 100px;
  background: blue;
  contain: paint;
  view-transition-name: target;
}
</style>

<div id=target></div>

<script>
let renderBlocked = true;

promise_test(() => {
  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
  return new Promise(async (resolve, reject) => {
    requestAnimationFrame(() => {
      document.startViewTransition(() => {
        return new Promise(async (inner_resolve) => {
          step_timeout(() => {
            renderBlocked = false;
            inner_resolve();
          }, 1000);
        });
      });

      requestAnimationFrame(() => {
        if (renderBlocked)
          reject();
        else
          resolve();
      });
    });
  });
}, "rAF is blocked until prepare callback");
</script>