I think most of those shortcuts for arrows are incorrect (shift opt 4 triggers screenshot in OS X)
Screenshot = Cmd + Shift + 3/4. The shortcuts on the website are correct.
Ah seems as Infinit triggers screenshot on alt also, just my thing then.
Yes, I tried alt also but nothing happened then :D
Really like the presentation of this. Even nice just to see a website without a white background.
Feature request: Encoded entity so I can easily copy the character into the CSS