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7.8 grohtml

The grohtml front end (which consists of a preprocessor, pre-grohtml, and a device driver, post-grohtml) translates the output of GNU troff to HTML. Users should always invoke grohtml via the groff command with a \-Thtml option. If no files are given, grohtml will read the standard input. A filename of - will also cause grohtml to read the standard input. HTML output is written to the standard output. When grohtml is run by groff, options can be passed to grohtml using groff’s -P option.

grohtml invokes groff twice. In the first pass, pictures, equations, and tables are rendered using the ps device, and in the second pass HTML output is generated by the html device.

grohtml always writes output in UTF-8 encoding and has built-in entities for all non-composite unicode characters. In spite of this, groff may issue warnings about unknown special characters if they can’t be found during the first pass. Such warnings can be safely ignored unless the special characters appear inside a table or equation, in which case glyphs for these characters must be defined for the ps device as well.

This output device is fully documented on its manual page, grohtml(1).