Have the browser (or OS) implement a clipboard. To paste, the middle-man software (either the OS or the browser) just inserts characters one after the other fro

Have the browser (or OS) implement a clipboard. To paste, the middle-man software (either the OS or the browser) just inserts characters one after the other from this clipboard. Similarly, to insert text into it, make a request to this middle-man software. Not kernel level of course, but built in. If its windows, call it "clippy" and bring back that paperclip character.