A bookmarklet is a special piece of JavaScript code that can be dragged into a user's link toolbar, and which later can be clicked on to implement cross-site behavior. People have done all sorts of cool stuff with it.
Bookmarklets have size limitations, which differ based on browser and platform, since they must fit into a certain number of characters. They can also be difficult to maintain for more sophisticated scripts, since every line of JavaScript code has to be jammed into one line.
I've put together a way to have huge, arbitrarily sized bookmarklets, where most of the code resides outside of the bookmarklet link. I'll explain how this works in this mini-tutorial.
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