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It's the output from mwgrep document.write as run from tin.
I omitted the "Private wiki results" section from the output (if there was any).
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Ah, I thought there might've been additional arguments passed to mwgrep to filter to a specific namespace.
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This is an interesting search; can anything be done about (what is mostly) the reams of documentation/"use instructions" on-(en.)wiki?
(I amusingly also uncovered a seeming previous error in Reflinks which would insert document.write.)
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@Izno This may be a better search:
insource:/document.write/ - Wikipedia search
The other one contained a fair number of false positives.