title: Android Back Button on a Progressive Web Application closes de App
body: <p>Can a "pure" HTML5/Javascript (progressive) web application intercept the mobile device back button in order to avoid the App to exit?</p>
  
  <p>This question is similar to <a href="https://stackoverflow.com/questions/8602722/phonegap-android-back-button-close-app-with-back-button-on-homepage">this one</a> but I want to know if it is possible to achieve such behavior without depending on PhoneGap/Ionic or Cordova.</p>