Method #isValidCSSChar

www/js/_hyperscript-max.js:230–232

(c)

      return c === "\r" || c === "\n";
    }
    #isValidCSSChar(c) {
      return this.#isAlpha(c) || this.#isNumeric(c) || c === "-" || c === "_" || c === ":";
    }
    #isIdentifierChar(c) {
      return c === "_" || c === "$";
    }