code: function iOSfix() {
    var iOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
  
    if (iOS && !hasClass(document.body, swalClasses.iosfix)) {
      var offset = document.body.scrollTop;
      document.body.style.top = offset * -1 + 'px';
      addClass(document.body, swalClasses.iosfix);
    }
  }
docs: /* istanbul ignore next