Ignorant JS user wonders: "what is purpose of '+' or '-' in column one?"

I have resumed studying the “Fundamentals” series recently revised and moved into the threejs.org site. Unfamiliar to me is the notation of a plus or minus sign in column one. Such as here:
three.js manual

Scroll down a ways to see column 1 notation.

Thanks for any feedback,
Rip van Winkle (feels like)

The minus should be the line of code that is being removed, plus - a line of code that is being added.

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OK, so a sort of inline documentation of code revision.

Thanks for answering!

it does seem a bit unnecessary to show a feature through a diff. and you can actually use color and map together, they’re not exclusive. :stuck_out_tongue:

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