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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/no-crash-view-transition-in-massive-iframe.html 

<!DOCTYPE html>
<title>View transitions: no crash with view-transitions in massive iframe</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>
iframe { width: 40000px; height: 40000px }
</style>

<iframe></iframe>

<script>
promise_test(async t => {
  const iframeDoc = document.getElementsByTagName("iframe")[0].contentDocument;
  assert_implements(iframeDoc.startViewTransition, "Missing document.startViewTransition in iframe");
  const transition = iframeDoc.startViewTransition();
  try { await transition.ready; } catch {}
}, "startViewTransition in massive iframe shouldn't crash.");
</script>