Method #isValidCSSChar

www/js/_hyperscript.esm.js:229–231

(c)

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