Example screenshot from the JavaScript console (Google Chrome 35, Win7) on a Facebook page:

How is this done? Is there a way to inspect/debug the console?
Console API Reference:
https://developers.google.com/web/tools/chrome-devtools/console/console-write#styling_console_output_with_css
Nice example of using the console.log:
console.log("%cUser %s has %d points", "color:orange; background:blue; font-size: 16pt", 'User', 100); Just paste it into the console :)
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