https://onesignal.com/blog/web-push-changes-to-chrome-on-android/
On Dec 5th, the permission prompt for notifications in Chrome on Android devices will change from a the current slide-up browser prompt (left) to a full screen browser popup (right) --

Google is making this change to discourage websites from showing the browser notification permission prompt when users first visit a website.
What OneSignal is changing in response
For OneSignal clients that are currently showing the browser’s notification permission prompt when a user first loads a website, we will be introducing a OneSignal slide-up permission box. The browser’s new full-screen permission prompt will be shown only after a user clicks "Allow" on the OneSignal permission box.
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