The way it work is this: you can copy multiple filetypes to the clipboard. So here, I copy a "text/html" and a "text/plain". When you paste to Google docs, it reads "text/html", and outputs a div that I've reconstructed to look like a joker card. When you paste to most other places (your address bar, a `<textarea>` element, terminal, etc.,), you get the plaintext fallback. So you can have two entirely different outputs, based on where you paste!

MDN surprisingly has no examples/API on this (the only time I've found it to be the case), so I instead link you w3c for reference: https://w3c.github.io/clipboard-apis/#clipboarditem