OptionalrootRoot to watch for plots. Defaults to document.body.
Quarto puts every OJS cell's output in div[id^="ojs-cell-"], but those
divs are filled asynchronously and re-filled whenever a reactive input
changes, so the observer watches a stable ancestor rather than the cells.
OptionalplotOptions applied to every plot the observer binds.
OptionalonCalled after each successful bind. Useful for logging, or for post-processing a schema the adapter inferred.
OptionalonCalled when a plot fails to convert, instead of the console warning.
Options for initObservablePlots.