 "inherit");
  test_valid_value("position-try-fallbacks", "unset");
  test_valid_value("position-try-fallbacks", "revert");
  test_valid_value("position-try-fallbacks", "none");
  test_valid_value("position-try-fallbacks", "flip-block");
  test_valid_value("position-try-fallbacks", "flip-block ", 'flip-block');
  test_valid_value("position-try-fallbacks", "flip-start, flip-block");
  test_valid_value("position-try-fallbacks", "flip-start flip-inline, flip-block");
  test_valid_value("position-try-fallbacks"