HandlebarsView.js

contact = HandlebarsView.create({

  template:  "<h1>{firstName} {lastName}</h1><br><h2>{emailAddress}</h2>"

});

--
// AUTOMATICALLY observes properties referenced in the template
contact.set('firstName', 'John');
contact.set('lastName', 'Doe');
contact.set('emailAddress', 'john@example.com');

---
contact.get('renderedTemplate'): 
> '<h1>John Doe</h1><br><h2>john@example.com</h2>'