For security reason imposed by the Browser the Past operation are permitted only on HTTPS domains and Localhost.
Not all browser support new ClipBoard API, so verify actual situation to know if your browser is supported.
On Browser without this built-in feature you can anyway do Copy operation.
On Browser that support this feature you can do both Copy and Past from Clipboard operations.
Copy&Paste works
Copy&Paste works
Copy only
Copy only
Copy only
Copy only