0%)");
test_valid_value("opacity", "max(50%, 0%)", "calc(50%)");
test_valid_value("opacity", "max(0%, 50%)", "calc(50%)");
test_valid_value("opacity", "min(-40%, 50%)", "calc(-40%)");
test_valid_value("opacity", "clamp(0.5, 0, 0.7)", "calc(0.5)");
test_valid_value("opacity", "clamp(0.5, 0.8, 0.7)", "calc(0.7)");
test_valid_value("opacity", "clamp(0.5, 0.6, 0.7)", "calc(0.6)");
test_valid_value("opacity", "min(0.5, 0)", "calc(0)");
test_valid_value("opacity", "min(0, 0.5)", "calc(0)");
test_valid_value("opac