Very good tool thank.
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As Tracy develops, these lists might grow to include other types of inputs and outputs. But for now, when we say sources, we are talking about:

Form fields
Query parameters
Post body parameters
Header values (to be supported)

and when we say sinks, we are talking about:

Server responses
DOM writes
Instances of eval (to be supported)
Instances of setTimeout (to be supported)
Instances of setInterval (to be supported)
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I hope you support the to be supported things