Ambiguities in event documentation

There are a few events that use the ambiguous wording "when X occurs", rather than a more precise "before X occurs" or "immediately after X occurs".

For instance, does StyleData fire after a style JSON has been fetched (but before it is applied), or later than that? (I was trying to find out whether this was a good hook to manipulate a style after it's been fetched but before it is rendered).

Also, I don't know if I'm looking in the wrong place, but I can't see anywhere where the on() function is documented. In particular, I was trying to find out whether event handlers like moveEnd are removed after they fire once - and if not, how one removes them?

Lastly, the ordering of the events in the documentation is a bit weird. moveend, mouseup, mousemove, touchstart, move, movestart...