How does Facebook put this formatted text in JavaScript console?

Question

By opening JavaScript console on Facebook it warns you not to put anything there, to be safe from scam. This seems a very good counter measure against "make your victim do the work for you" attacks. How do they do this?

Answer 1

console.log() can be formatted with inline CSS

This:

console.log("%cThis will be formatted with large, blue text", "color: blue; font-size: x-large");

Will look like this:

Source