Log in as admin
Create a new user
Navigate to Users > Permissions > Site administrators in site administration
Select user and press Add
Confirm the confirmation prompt shows the buttons ordered [ Cancel, Continue ]
Press Continue
Confirm new admin was added
Select the new admin and press Remove
Confirm the confirmation prompt shows the buttons ordered [ Cancel, Continue ]
Press Cancel
Confirm new admin was not removed
This will make them consistent with MDL-73797 (Client site confirmation prompts), and eventually MDL-74259