JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app='test'>
    <div ng-controller='testCtrl'> <span>{{testContent}}</span> 
    </div>
    <div ng-controller="testCtrl2">
        <input type='text' ng-change="updateContent()" ng-model="testContent2" />
    </div>
</div>

JavaScript

var app = angular.module('test', []);
app.factory('sharedContent', function ($rootScope) {
    var standardContent;
    var resizeProportion;
    return {
        setStandardContent: function (newStandardContent) {
            standardContent = newStandardContent;
            $rootScope.$broadcast('updateContent');
            console.log('broadcast');
        },
        getStandardContent: function () {
            return standardContent;
        },
        setResizeProportion: function (newResizeProportion) {
            $rootScope.$broadcast('updateResizeProportion');
        },
    }
});
app.run(function (sharedContent) {
    console.log("app.run running");
    sharedContent.setStandardContent('haha');
});

function testCtrl($scope, sharedContent) {
    console.log("testCtrl running");

    updateTestContent();
    $scope.$on('updateContent', updateTestContent);


    function updateTestContent(){
        $scope.testContent = sharedContent.getStandardContent();
    }
}

function testCtrl2($scope, sharedContent) {
    console.log("testCtrl2 running");
    
    $scope.testContent2 = 'test';
    $scope.updateContent = function () {
        sharedContent.setStandardContent($scope.testContent2);
    };
}