Machine Learning
a simple image classifier as a web app.
You can use common objects or face/body gestures to capture images for each of the three classes. Each time you click one of the "Add" buttons, one image is added to that class as a training example. While you do this, the model continues to make predictions on webcam images coming in and shows the results in real-time.
Visit js.tensorflow.org for more examples and demos with code to see how you can use TensorFlow.js in your applications.