Clipboard and Jails

I think I know the answer to this, but want to confirm...

I'm setting up the Falkon browser in my jails, and one of the options is to allow Javascript access to the clipboard. I'm guessing that it only has access to the clipboard internal to the jail, but I really want to confirm that.

The reason I'm doubting myself is because of how easy it is to copy/paste between jails. I want to make sure that internal jails Javascript don't have permissionless access to host clipboard.
 
I'm not asking IF or HOW to accomplish clipboard ops. I have no problems.

I'm asking about how jails cliboard functions under the hood with the security implications.
 
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