I think there is a bug on Introduction to Objects I - lesson 3...Ah the good!
Everytime I press 'Save & Submit Code' button my browser pop up print page window and it keep opening it no matter what I do. When I click on cancel it opens it again in a second. When I click print, it does the same. When I want to close window, it doesn't allow. When I want to quit browser, it doesn't allow that too. Only solution is to restart computer.
This happens both on my Macbook Pro with El Capitan and desktop PC with windows 7 and both on safari and mozilla firefox. I didn't try with other browsers.
Does anyone have same problem