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Probably most of the work is hidden in the underlying "framework" or "language". Here's a text editor in 1 line of html: <textarea></textarea>

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APL is an extraordinarily concise programming language, even without taking its environment into account. This is a well known implementation of Conway's Game of Life in APL:

↑1 ⍵∨.∧3 4=+/,¯1 0 1∘.⊖¯1 0 1∘.⌽⊂⍵

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