Method #isValidCSSChar

src/core/tokenizer.js:281–283

(c)

    }

    #isValidCSSChar(c) {
        return this.#isAlpha(c) || this.#isNumeric(c) || c === "-" || c === "_" || c === ":";
    }

    #isIdentifierChar(c) {
        return c === "_" || c === "$";