Worldwide
To date (summer 2016), Web Push API is supported by the latest versions of most popular browsers: Chrome (version 50+) and Firefox (version 46+) and Safari.
Supported browsers worldwide
- Chrome v.50 and above
- Safari
- FireFox v.46 and above
According to the caniuse.com website, the percentage of such browsers is about 45%. And the presented data shows that this share is growing.