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based on the number of characters , total of 10 000 characters, so each character is 0.01 percent. (10000 = 100%) maybe for bigger publications a larger number of total characters

Monospaced font, maybe more info to show up on mouse rollover or something

easy to program yet an typographic approach unlike anything thats on the visible data website right now

kinda reminds me of http://www.joodsmonument.nl/