JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="organHome">
<dl class="sub-nav" ng-controller="inModalSwitchCtrl">
 <dd ng-class="content:bold"><a ng-click="switchContent()" ng-model="content">Contents</a></dd>
 <dd ng-class="comment:bold"><a ng-model="comment" ng-click="switchComment()">Comments</a></dd>
</dl>
</div>

JavaScript

angular.module('organHome', [])

  .controller('inModalSwitchCtrl', function ($scope) {
      $scope.content = true;
      $scope.comment = false;
      
      $scope.switchContent = function() {
          $scope.content = true;
          $scope.comment = false;
      };
      
      $scope.switchComment = function() {
          $scope.comment = true;
          $scope.content = false;
      };
  });