A page can listen for the copy event and rewrite what lands on your clipboard.
The box shows a harmless command; with hijacking on, the clipboard gets something extra.
This is real (within this frame) but the payload is a harmless echo string.
— copy something to see —
You can also just select the text above and press Ctrl/Cmd+C — the same copy-event hijack fires.
The 2024–25 wave: a fake CAPTCHA copies a command to your clipboard, then tells you to paste it into the Windows Run dialog / Terminal. Nothing here runs — this is an awareness mock so you recognize the pattern.
A form shows two innocent fields, but hides several more off-screen. When the browser/password manager autofills, it can fill the hidden ones too — and they're submitted to the attacker. Reveal them, then simulate an autofill.
— autofill, then submit —