Аджинкья указал вам правильное направление ... оттуда:
var firstApp = angular.module("firstApp", []);
var secondApp = angular.module("secondApp", []);
firstApp.controller("faController", function($scope) {});
secondApp.controller("saController", function($scope) {});
angular.element(document).ready(function() {
angular.bootstrap(document.getElementById("firstApp"), ['firstApp']);
angular.bootstrap(document.getElementById("secondApp"), ['secondApp']);
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<p>Change the value of the input field:</p>
<div id="firstApp" ng-controller="faController" ng-init="myCol='lightblue'">
<input style="background-color:{{myCol}}" ng-model="myCol">
</div>
<div id="secondApp" ng-controller="saController" ng-init="myColor2='lightpink'">
<input style="background-color:{{myColor2}}" ng-model="myColor2">
</div>
<p>AngularJS resolves the expression and returns the result.</p>
<p>The background color of the input box will be whatever you write in the input field.</p>