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HTML

              
                <div ng-controller="InputController">
    <input ng-bind="message"/>   
    <input ng-bind="message"/>   
    <button onclick="onButtonClick()">Click!</button>
</div>
              
            
!

CSS

              
                
              
            
!

JS

              
                /* Framework code */
(function () {
  var controllers = {};
  var addController = function (name, constructor) {
    // Store controller constructor
    controllers[name] = {
      factory: constructor,
      instances: []
    };

    // Look for elements using the controller 
    var element = document.querySelector('[ng-controller=' + name + ']');
    if (!element){   
      return;
    }

    // Create a new instance and save it
    var ctrl = new controllers[name].factory();
    controllers[name].instances.push(ctrl);

    // Get elements bound to properties
    var bindings = {};
    Array.prototype.slice.call(element.querySelectorAll('[ng-bind]'))
      .map(function (element) {
      var boundValue = element.getAttribute('ng-bind');

      if (!bindings[boundValue]) {
        bindings[boundValue] = {
          boundValue: boundValue,
          elements: []
        }
      }

      bindings[boundValue].elements.push(element);
    });    

    // Update DOM element bound when controller property is set
    var proxy = new Proxy (ctrl, {
      set: function (target, prop, value) {    
        var bind = bindings[prop];
        if (bind) {  
          bind.elements.forEach(function (element) {
            element.value = value;
            element.setAttribute('value', value);
          });
        }
        return Reflect.set(target, prop, value);
      }
    });

    // Listen DOM element update to set the controller property
    Object.keys(bindings).forEach(function (boundValue) {
      var bind = bindings[boundValue];
      bind.elements.forEach(function (element) {
        element.addEventListener('input', function (event) {
          proxy[bind.boundValue] = event.target.value;
        });
      })  
    });

    // Fill proxy with ctrl properties
    // and return proxy, not the ctrl !
    Object.assign(proxy, ctrl);
    return proxy;
  }

  // Export framework in window
  this.angular = {
  	controller: addController
  }
})();
  
/* User code */
function InputController () {
  this.message = 'Hello World!';
}

var myInputController = angular.controller('InputController', InputController);

function onButtonClick () {
  myInputController.message = 'Clicked!';   
}
  

              
            
!
999px

Console