How Does Mapbox Offer a Job in JavaScript Output?

For exmaple:

1- Go to https://www.mapbox.com/mapbox.js/example/v1.0.0/leaflet-image/

2- Open Developer Tools

What you see in Console is:

* .--. / / ` + | | ' \ \__, * + '--' * + /\ + .' '. * * /======\ + ;:. _ ; |:. (_) | |:. _ | + |:. (_) | * ;:. ; .' \:. / `. / .-'':._.'`-. \ |/ /||\ \| _..--"""````"""--.._ _.-'`` ``'-._ -' Hello, explorer '- Curious? http://mapbox.com/jobs