https://thenextweb.com/google/2020/02/20/android-11-tries-to-make-floating-chat-bubbles-a-thing-again/

When Google first began teasing Android 10 last year – then still known as Android Q – it led us to believe the company would begin to use floating bubbles as an alternative or supplement to the standard notification shade. These bubbles allow you to interact with notifications or continue conversations easily while within other apps, and can be moved around the screen for convenient access. Unfortunately, it seems the feature was not ready for prime time and it was ultimately hidden away in the final release of Android 10.

Now the feature is making a comeback in the first Android 11 Developer Preview. Per Google’s own description of the feature: