But if saxon.extensions is zero, no extensions will be used. If line numbering is enabled, everyNth line will be numbered. The separator is inserted between line numbers and lines in the verbatim environment. The callouts extension processes areaset elements in ProgramListingCO and other text-based callout elements. This variable answers that question.
Valid settings are 'html' or 'fo'.
In order to convert CALS column widths into HTML column widths, it is sometimes necessary to have an absolute table width to use for conversion of mixed absolute and relative widths. The table columns extension function adjusts the widths of table columns in the HTML result to more accurately reflect the specifications in the CALS table.