1- Document.execCommand()
2- Interact with the clipboard
While document 1 states that the API is Obsolete (without providing alternative), document 2 states the API as a viable method.
Note: The Clipboard API only provides some of the functions of the obsolete Document.execCommand().
The API issues is not the focus of this post but the MDN documentation inconsistency between the aforementioned pages.
Although there is no alternative for some of the functions of the obsolete Document.execCommand(), for example, mentioning that the method is obsolete on the 2nd document could improve consistency.