У вашего броузера проблема в совместимости с HTML5
In this video we will learn about service workers and how to use them to cache pages for offline viewing. Service workers are a huge aspect of PWA's or "Progressive Web Apps". We will add a service worker to a tiny sample website so that if the connection goes out, users can still view the pages.
Sponsor:
DevMountain Bootcamp - https://goo.gl/6q0dEa
Code For This Project:
http://traversymedia.com/downloads/simple_service_worker.zip
Node.js Push Notifications Tutorial:
https://www.youtube.com/watch?v=HlYFW2zaYQM&t=739s
? Become a Patron: Show support & get perks!
http://www.patreon.com/traversymedia
Website & Udemy Courses
http://www.traversymedia.com
Follow Traversy Media:
https://www.facebook.com/traversymedia
https://www.twitter.com/traversymedia