Styling console.log() output

It is possible to style console.log() output by utilising the %c format specifier and passing a string of styles.

console.log('%ctest', 'font-size: 40px; color: red; text-transform: uppercase');

Example of styled console log output

This can be useful for a number of things:

Warning users against copying and pasting code into the console. Facebook currently log such a warning with some obvious styling.
Making specific log messages stand out for debugging purposes.
Companies used to leave job advert and easter egg comments hidden in HTML to target developers who were using view-source. In an age of minification, perhaps leaving these in the console could be a new approach!

Happy logging!