code: function displayActiveDom(ifControlPanel, ifverifySignupLong, ifresetPwdLong) {
    controlPanelEl.style.display = ifControlPanel ? 'block' : 'none';
    verifySignupLongEl.style.display = ifverifySignupLong ? 'block' : 'none';
    resetPwdLongEl.style.display = ifresetPwdLong ? 'block' : 'none';
  }
docs: display utility