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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/only-child-no-transition.html 

<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: :only-child style queries without transition shouldn't crash</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>
::view-transition:only-child,
::view-transition-group(*):only-child,
::view-transition-image-pair(*):only-child,
::view-transition-old(*):only-child,
::view-transition-new(*):only-child {
  background-color: blue;
}
</style>

<script>
promise_test(() => {
  return new Promise(async (resolve, reject) => {
    let elements = [
      "::view-transition",
      "::view-transition-group(foo)",
      "::view-transition-image-pair(foo)",
      "::view-transition-old(foo)",
      "::view-transition-old(foo)"
    ];

    for (let i = 0; i < elements.length; i++) {
      let style = window.getComputedStyle(document.documentElement, elements[i]);
      if (style.backgroundColor == "rgb(0, 0, 255")
        reject();
    }
    resolve();
  });
}, ":only-child style queries without transition shouldn't crash");
</script>