, "flip-start, flip-start");
  test_valid_value("position-try-fallbacks", "flip-start flip-inline flip-block");
  test_valid_value("position-try-fallbacks", "flip-block, --foo");
  test_valid_value("position-try-fallbacks", "--bar, flip-block flip-start");
  test_valid_value("position-try-fallbacks", "--foo, --bar, --baz");
  test_valid_value("position-try-fallbacks", "--bar flip-block");
  test_valid_value("position-try-fallbacks", "--bar flip-inline flip-block");
  test_valid_value("position-try-fallbacks