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it all started with @alistaparts 10K apart contest, in which participants build working web apps in no more than 10K of assets. which is cool, but since you get jquery and typekit for free, isn't too difficult a constraint... a lot of the winning apps had a lot of space left over.
local storage is one example. this 139-byte provides a get/set API that handles JSON serialization if your browser supports it, falling back to object storage otherwise.