// source http://jsbin.com/comawi

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body ng-app="app"  
      ng-controller="OneBindingController" 
      >

<a ng-click="startWatching=true" href="#"> Start Watching</a>
  <span>: {{startWatching}}</span> <br>
  
  <a ng-click="assignValues()" href="#">  Assign values</a>
  <br>
  
  <hr>
  
  
  values:
  <div ng-if="::startWatching"> 
    <span>{{::value1}}</span> 
    <span>{{::value2}}</span>
    <span>{{::value3}}</span>
    <span>{{::value4}}</span>
    <span>{{::value5}}</span>
  </div>

<hr>
  <span> watchers: {{watchers }}</span>

<br ng-init="countWatchers()"> 
<script id="jsbin-javascript">
angular.module('app', [])
.controller("OneBindingController", function($scope , $interval){
  
  $scope.assignValues = function(){
    $scope.value1 = 1;
    $scope.value2 = 2;
    $scope.value3 = 3;
    $scope.value4 = 4;
    $scope.value5 = 5; 
  };

function countWatchers() { 
    var root = angular.element(document.getElementsByTagName('body'));

var watchers = [];

angular.forEach(element.children(), function (childElement) {
            f(angular.element(childElement));
        });
    };

f(root);

// Remove duplicate watchers
    var watchersWithoutDuplicates = [];
    angular.forEach(watchers, function(item) {
        if(watchersWithoutDuplicates.indexOf(item) < 0) {
             watchersWithoutDuplicates.push(item);
        }
    });

$scope.watchers = watchersWithoutDuplicates.length;
  }
  
  $interval(countWatchers, 100);
  
});
</script>

<hr>
  <span> watchers: {{watchers }}</span>

function countWatchers() { 
    var root = angular.element(document.getElementsByTagName('body'));

var watchers = [];

angular.forEach(element.children(), function (childElement) {
            f(angular.element(childElement));
        });
    };

f(root);

$scope.watchers = watchersWithoutDuplicates.length;
  }
  
  $interval(countWatchers, 100);
  
});
</script></body>
</html>

Modified http://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js to a secure url

https://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js