window.addEventListener('beforeinstallprompt', function(e) {
      console.log('event beforeinstallprompt')
      e.userChoice.then(function(choiceResult) {

        console.log(choiceResult.outcome);

        if(choiceResult.outcome == 'dismissed') {
          console.log('User cancelled home screen install');
          METRICS.controller.send_metric({name:'dismissed_pwa_install',type:'mobile_form'})
        }
        else {
          console.log('User added to home screen');
          METRICS.controller.send_metric({name:'pwa_install',type:'mobile_form'})
        }
      });
    });