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Re:Show HN: Behave.js – Coding Behaviors for textarea elements by est on Friday January 25, 2013 @01:18AM (#5114290)
Okay,

suppose this line:

    result = someFunction(param1, param2='ok')
mouse over to `someFunction`, a small box shows brief description of function, what it does, how many parameters are required, what does optional parameters do.

It's basically a richer version of <span title="text" alt="text"</span>

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