Selecting a range across blocks, then deleting it
In an existing contenteditable with <p>Hello World</p><p>Goodbye Space</p> in it, select from the beginning of World to the end of Goodbye then hit the backspace key then the space key.

Chrome (Desktop)

Safari (Desktop)

Firefox (Desktop)

Android API 28

Android API 27

Android API 26

Android API 25

Android API 24

Android API 23

iOS 11.4