on-service-worker-installed handler not called in PolymerLabs/todo-list

[kellerapps]

Description

on-service-worker-installed handler (displayInstalledToast() declared in index.html & implemented in app.js) not called in PolymerLabs/todo-list. Also, if the page is reloaded, there's a console msg about boostrap/sw-toolbox-setup.js.

Expected outcome

Toast appears. A console msg I added appears. A breakpoint I set paused.

Actual outcome

No toast, console msg, or breakpoint.

Live Demo

Steps to reproduce

1. gulp serve (or serve:dist)
2. observe localhost:5001

Browsers Affected

• Chrome (only one tried)
• Firefox
• Safari 9
• Safari 8
• Safari 7
• Edge
• IE 11
• IE 10