On: I reverse engineered Google Docs to play back any ...

[SkyPuncher]

Jetbrain's IDEs label it as "annotate".

Though, I suspect that's intended as a generalization of the various VCS options they support.

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I do think it'd be good to move away from the negative connotation associated with blame. I want to know who to ask about some code, not who to blame for it breaking.

[z3t4 → SkyPuncher]

Annotate is used in Mercurial (and probably others).

[astura → SkyPuncher]

CVS called it annotate back in the 90s.