docs: public RemoteWebDriverBuilder setCapability(String capabilityName, String value) {
      if (!OK_KEYS.test(capabilityName)) {
        throw new IllegalArgumentException("Capability is not valid");
      }
      if (value == null) {
        throw new IllegalArgumentException("Null values are not allowed");
      }
  
      additionalCapabilities.put(capabilityName, value);
      return this;
    }