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This is a screenshot of a little Xmas web puzzle.
(Please note this only works in Firefox)
View the actual page here: Web Developers Xmas Challenge
Try and view the source code, and try and figure out how the web page works.
Please dont spoil the game by posting the answer in the comments, thanks. Give yourself a pat on the back if you can work it out. :)
(This puzzle was inspired by Mathias Bynens)