Available in Chrome 40+
This sample demonstrates basic service worker registration, in conjunction with selective caching.
In this case, we're caching all font resources by checking for responses with a Content-Type header
that starts with font/. The same principle can be extended to selectively cache any category of
content based on request or response headers (assuming the response is
non-opaque).
Visit chrome://inspect/#service-workers and click on the "inspect" link below
the registered service worker to view logging statements for the various actions the
service-worker.js script is performing.