text: (function () {
    'use strict';
  
    var markbotBtnIcon = document.getElementById('markbot-btn-icon');
    var markbotBtnMac = document.getElementById('markbot-btn-mac');
    var markbotBtnWin = document.getElementById('markbot-btn-win');
    var isWin = (navigator.appVersion.indexOf('Win') != -1) ? true : false;
  
    if (!markbotBtnMac && !markbotBtnWin && !markbotIconBtn) return;
  
    if (isWin) {
      markbotBtnMac.setAttribute('hidden', true);
      markbotBtnWin.removeAttribute('hidden');
      markbotBtnIcon.href = markbotBtnWin.querySelector('a').href;
    } else {
      markbotBtnMac.removeAttribute('hidden');
      markbotBtnWin.setAttribute('hidden', true);
      markbotBtnIcon.href = markbotBtnMac.querySelector('a').href;
    }
  }());
  