Websites are capable of asking to send notifications in a number of browsers, Chrome included. In this case, they may be particularly capable of disrupting the app's experience as they are markedly large and obtrusive, especially on mobile devices. The latest update to Chrome Canary for Android adds options to restrict or block them.
https://www.notebookcheck.net/Chrome-reigns-its-pervasive-website-notification-prompts-in-on-Android.443204.0.html