There are a variety of command-line string parameters (Section 5.5) for use by developers testing new code or diagnosing problems. As of 2021-02-14 we are collecting their definitions in the pretext-common.xsl stylesheet early on. Search on debug. to find them. Elsewhere the names might be a bit more variable until we get them all rounded up in one place, but usually the name contains debug somewhere. No documentation here, these are not documented (or stable), and only intended for authors as a stop-gap measure before being replaced in function. Read the code for more, while some more permanent versions will be mentioned in this chapter.