Function isContainerKeyword

lib/css/CssParser.js:535–546

(input, start, end)

 * @returns {boolean} true for a container keyword
 */
const isContainerKeyword = (input, start, end) => {
	switch (end - start) {
		case 2:
			return input.startsWith("or", start);
		case 3:
			return input.startsWith("and", start) || input.startsWith("not", start);
		case 4:
			return input.startsWith("none", start);
		default:
			return false;
	}
};

/**
 * @param {string} input source