node_modules/prismjs/tests/languages/css/function_feature.test

transform: translate(-50%);
background: rgba(0, 0, 0, 0.2);
filter: opacity(alpha=0);

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[
	["property", "transform"],
	["punctuation", ":"],
	["function", "translate"],
	["punctuation", "("],
	"-50%",
	["punctuation", ")"],
	["punctuation", ";"],

	["property", "background"],
	["punctuation", ":"],
	["function", "rgba"],
	["punctuation", "("],
	"0, 0, 0, 0.2",
	["punctuation", ")"],
	["punctuation", ";"],

	["property", "filter"],
	["punctuation", ":"],
	["function", "opacity"],
	["punctuation", "("],
	"alpha=0",
	["punctuation", ")"],
	["punctuation", ";"]
]

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Checks for functions.