[only-child-group.html]
  expected:
    if (os == "win") and debug and (processor == "x86_64"): [OK, ERROR]
  [:only-child should match because ::view-transition-group is generated for root element only]
    expected:
      if (os == "mac") and not debug: [PASS, FAIL]
      if (os == "android") and not debug: [PASS, FAIL]

  [:only-child should match because ::view-transition-group is generated for sub element only]
    expected:
      if (os == "mac") and not debug: [PASS, FAIL]
      if (os == "android") and not debug: [PASS, FAIL]