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Diff for /mandoc/mandoc.1 between version 1.53 and 1.66

version 1.53, 2010/03/25 07:28:16 version 1.66, 2010/06/29 14:55:41
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 .\"     $Id$  .\"     $Id$
 .\"  .\"
 .\" Copyright (c) 2009 Kristaps Dzonsons <kristaps@kth.se>  .\" Copyright (c) 2009 Kristaps Dzonsons <kristaps@bsd.lv>
 .\"  .\"
 .\" Permission to use, copy, modify, and distribute this software for any  .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above  .\" purpose with or without fee is hereby granted, provided that the above
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 .Dd $Mdocdate$  .Dd $Mdocdate$
 .Dt MANDOC 1  .Dt MANDOC 1
 .Os  .Os
 .  
 .  
 .Sh NAME  .Sh NAME
 .Nm mandoc  .Nm mandoc
 .Nd format and display UNIX manuals  .Nd format and display UNIX manuals
 .  
 .  
 .Sh SYNOPSIS  .Sh SYNOPSIS
 .Nm mandoc  .Nm mandoc
 .Op Fl f Ns Ar option...  .Op Fl V
   .Op Fl f Ns Ar option
 .Op Fl m Ns Ar format  .Op Fl m Ns Ar format
 .Op Fl O Ns Ar option...  .Op Fl O Ns Ar option
 .Op Fl T Ns Ar output  .Op Fl T Ns Ar output
 .Op Fl V  .Op Fl W Ns Ar err
 .Op Fl W Ns Ar err...  .Op Ar file...
 .Op Ar infile...  
 .  
 .  
 .Sh DESCRIPTION  .Sh DESCRIPTION
 The  The
 .Nm  .Nm
 utility formats  utility formats
 .Ux  .Ux
 manual pages for display.  The arguments are as follows:  manual pages for display.
 .  The arguments are as follows:
 .Bl -tag -width Ds  .Bl -tag -width Ds
 .It Fl f Ns Ar option...  .It Fl f Ns Ar option
 Comma-separated compiler options.  See  Comma-separated compiler options.
   See
 .Sx Compiler Options  .Sx Compiler Options
 for details.  for details.
 .  
 .It Fl m Ns Ar format  .It Fl m Ns Ar format
 Input format.  See  Input format.
   See
 .Sx Input Formats  .Sx Input Formats
 for available formats.  Defaults to  for available formats.
 .Fl m Ns Ar andoc .  Defaults to
 .  .Fl m Ns Cm andoc .
 .It Fl O Ns Ar option...  .It Fl O Ns Ar option
 Comma-separated output options.  See  Comma-separated output options.
 .Sx Output Options  
 for details.  
 .  
 .It Fl T Ns Ar output  .It Fl T Ns Ar output
 Output format.  See  Output format.
   See
 .Sx Output Formats  .Sx Output Formats
 for available formats.  Defaults to  for available formats.
 .Fl T Ns Ar ascii .  Defaults to
 .  .Fl T Ns Cm ascii .
 .It Fl V  .It Fl V
 Print version and exit.  Print version and exit.
 .  .It Fl W Ns Ar err
 .It Fl W Ns Ar err...  Comma-separated warning options.
 Comma-separated warning options.  Use  Use
 .Fl W Ns Ar all  .Fl W Ns Cm all
 to print warnings,  to print warnings,
 .Fl W Ns Ar error  .Fl W Ns Cm error
 for warnings to be considered errors and cause utility  for warnings to be considered errors and cause utility
 termination.  Multiple  termination.
   Multiple
 .Fl W  .Fl W
 arguments may be comma-separated, such as  arguments may be comma-separated, such as
 .Fl W Ns Ar error,all .  .Fl W Ns Cm error , Ns Cm all .
 .  .It Ar file
 .It Ar infile...  Read input from zero or more files.
 Read input from zero or more  If unspecified, reads from stdin.
 .Ar infile .  If multiple files are specified,
 If unspecified, reads from stdin.  If multiple files are specified,  
 .Nm  .Nm
 will halt with the first failed parse.  will halt with the first failed parse.
 .El  .El
 .  
 .Pp  .Pp
 By default,  By default,
 .Nm  .Nm
Line 95  reads
Line 87  reads
 or  or
 .Xr man 7  .Xr man 7
 text from stdin, implying  text from stdin, implying
 .Fl m Ns Ar andoc ,  .Fl m Ns Cm andoc ,
 and produces  and produces
 .Fl T Ns Ar ascii  .Fl T Ns Cm ascii
 output.  output.
 .  
 .Pp  .Pp
 .Ex -std mandoc  .Ex -std mandoc
 .  
 .  
 .Ss Input Formats  .Ss Input Formats
 The  The
 .Nm  .Nm
Line 112  utility accepts
Line 101  utility accepts
 and  and
 .Xr man 7  .Xr man 7
 input with  input with
 .Fl m Ns Ar doc  .Fl m Ns Cm doc
 and  and
 .Fl m Ns Ar an ,  .Fl m Ns Cm an ,
 respectively.  The  respectively.
   The
 .Xr mdoc 7  .Xr mdoc 7
 format is  format is
 .Em strongly  .Em strongly
 recommended;  recommended;
 .Xr man 7  .Xr man 7
 should only be used for legacy manuals.  should only be used for legacy manuals.
 .  
 .Pp  .Pp
 A third option,  A third option,
 .Fl m Ns Ar andoc ,  .Fl m Ns Cm andoc ,
 which is also the default, determines encoding on-the-fly: if the first  which is also the default, determines encoding on-the-fly: if the first
 non-comment macro is  non-comment macro is
 .Sq \&Dd  .Sq \&Dd
Line 136  the
Line 125  the
 parser is used; otherwise, the  parser is used; otherwise, the
 .Xr man 7  .Xr man 7
 parser is used.  parser is used.
 .  
 .Pp  .Pp
 If multiple  If multiple
 files are specified with  files are specified with
 .Fl m Ns Ar andoc ,  .Fl m Ns Cm andoc ,
 each has its file-type determined this way.  If multiple files are  each has its file-type determined this way.
   If multiple files are
 specified and  specified and
 .Fl m Ns Ar doc  .Fl m Ns Cm doc
 or  or
 .Fl m Ns Ar an  .Fl m Ns Cm an
 is specified, then this format is used exclusively.  is specified, then this format is used exclusively.
 .  .Ss Compiler Options
 .  Default
   .Xr mdoc 7
   and
   .Xr man 7
   compilation behaviour may be overridden with the
   .Fl f
   flag.
   .Bl -tag -width Ds
   .It Fl f Ns Cm ign-errors
   When parsing multiple files, don't halt when one errors out.
   Useful with
   .Fl T Ns Cm lint
   over a large set of manuals passed on the command line.
   .It Fl f Ns Cm ign-escape
   Ignore invalid escape sequences.
   This is the default, but the option can be used to override an earlier
   .Fl f Ns Cm strict .
   .It Fl f Ns Cm ign-scope
   When rewinding the scope of a block macro, forces the compiler to ignore
   scope violations.
   This can seriously mangle the resulting tree.
   .Pq mdoc only
   .It Fl f Ns Cm no-ign-escape
   Do not ignore invalid escape sequences.
   .It Fl f Ns Cm no-ign-macro
   Do not ignore unknown macros at the start of input lines.
   .It Fl f Ns Cm strict
   Implies
   .Fl f Ns Cm no-ign-escape
   and
   .Fl f Ns Cm no-ign-macro .
   .El
 .Ss Output Formats  .Ss Output Formats
 The  The
 .Nm  .Nm
 utility accepts the following  utility accepts the following
 .Fl T  .Fl T
 arguments (see  arguments, which correspond to output modes:
 .Sx OUTPUT ) :  
 .  
 .Bl -tag -width Ds  .Bl -tag -width Ds
 .It Fl T Ns Ar ascii  .It Fl T Ns Cm ascii
 Produce 7-bit ASCII output, backspace-encoded for bold and underline  Produce 7-bit ASCII output, backspace-encoded for bold and underline
 styles.  This is the default.  See  styles.
   This is the default.
   See
 .Sx ASCII Output .  .Sx ASCII Output .
 .  .It Fl T Ns Cm html
 .It Fl T Ns Ar html  Produce strict HTML-4.01 output, with a sane default style.
 Produce strict HTML-4.01 output, with a sane default style.  See  See
 .Sx HTML Output .  .Sx HTML Output .
 .  .It Fl T Ns Cm lint
 .It Fl T Ns Ar xhtml  
 Produce strict XHTML-1.0 output, with a sane default style.  See  
 .Sx XHTML Output .  
 .  
 .It Fl T Ns Ar tree  
 Produce an indented parse tree.  
 .  
 .It Fl T Ns Ar lint  
 Parse only: produce no output.  Parse only: produce no output.
 Implies  Implies
 .Fl W Ns Ar all  .Fl W Ns Cm all
 and  and
 .Fl f Ns Ar strict .  .Fl f Ns Cm strict .
   .It Fl T Ns Cm ps
   Produce PostScript output.
   See
   .Sx PostScript Output .
   .It Fl T Ns Cm tree
   Produce an indented parse tree.
   .It Fl T Ns Cm xhtml
   Produce strict XHTML-1.0 output, with a sane default style.
   See
   .Sx XHTML Output .
 .El  .El
 .  
 .Pp  .Pp
 If multiple input files are specified, these will be processed by the  If multiple input files are specified, these will be processed by the
 corresponding filter in-order.  corresponding filter in-order.
 .  
 .  
 .Ss Compiler Options  
 Default compiler behaviour may be overridden with the  
 .Fl f  
 flag.  
 .  
 .Bl -tag -width Ds  
 .It Fl f Ns Ar ign-scope  
 When rewinding the scope of a block macro, forces the compiler to ignore  
 scope violations.  This can seriously mangle the resulting tree.  
 .Pq mdoc only  
 .  
 .It Fl f Ns Ar ign-escape  
 Ignore invalid escape sequences.  
 This is the default, but the option can be used to override an earlier  
 .Fl f Ns Ar strict .  
 .  
 .It Fl f Ns Ar no-ign-escape  
 Don't ignore invalid escape sequences.  
 .  
 .It Fl f Ns Ar no-ign-macro  
 Do not ignore unknown macros at the start of input lines.  
 .  
 .It Fl f Ns Ar no-ign-chars  
 Do not ignore disallowed characters.  
 .  
 .It Fl f Ns Ar strict  
 Implies  
 .Fl f Ns Ar no-ign-escape ,  
 .Fl f Ns Ar no-ign-macro  
 and  
 .Fl f Ns Ar no-ign-chars .  
 .  
 .It Fl f Ns Ar ign-errors  
 Don't halt when encountering parse errors.  Useful with  
 .Fl T Ns Ar lint  
 over a large set of manuals passed on the command line.  
 .El  
 .  
 .  
 .Ss Output Options  
 For the time being, only  
 .Fl T Ns Ar html  
 and  
 .Fl T Ns Ar xhtml  
 accepts output options:  
 .Bl -tag -width Ds  
 .It Fl O Ns Ar style=style.css  
 The file  
 .Ar style.css  
 is used for an external style-sheet.  This must be a valid absolute or  
 relative URI.  
 .It Fl O Ns Ar includes=fmt  
 The string  
 .Ar fmt ,  
 for example,  
 .Ar ../src/%I.html ,  
 is used as a template for linked header files (usually via the  
 .Sq \&In  
 macro).  Instances of  
 .Sq \&%I  
 are replaced with the include filename.  The default is not to present a  
 hyperlink.  
 .It Fl O Ns Ar man=fmt  
 The string  
 .Ar fmt ,  
 for example,  
 .Ar ../html%S/%N.%S.html ,  
 is used as a template for linked manuals (usually via the  
 .Sq \&Xr  
 macro).  Instances of  
 .Sq \&%N  
 and  
 .Sq %S  
 are replaced with the linked manual's name and section, respectively.  
 If no section is included, section 1 is assumed.  The default is not to  
 present a hyperlink.  
 .El  
 .  
 .  
 .Sh OUTPUT  
 This section documents output details of  
 .Nm .  
 In general, output conforms to the traditional manual style of a header,  
 a body composed of sections and sub-sections, and a footer.  
 .Pp  
 The text style of output characters (non-macro characters, punctuation,  
 and white-space) is dictated by context.  
 .Pp  
 White-space is generally stripped from input.  This can be changed with  
 character escapes (specified in  
 .Xr mandoc_char 7 )  
 or literal modes (specified in  
 .Xr mdoc 7  
 and  
 .Xr man 7 ) .  
 .Pp  
 If non-macro punctuation is set apart from words, such as in the phrase  
 .Dq to be \&, or not to be ,  
 it's processed by  
 .Nm ,  
 regardless of output format, according to the following rules:  opening  
 punctuation  
 .Po  
 .Sq \&( ,  
 .Sq \&[ ,  
 and  
 .Sq \&{  
 .Pc  
 is not followed by a space; closing punctuation  
 .Po  
 .Sq \&. ,  
 .Sq \&, ,  
 .Sq \&; ,  
 .Sq \&: ,  
 .Sq \&? ,  
 .Sq \&! ,  
 .Sq \&) ,  
 .Sq \&]  
 and  
 .Sq \&}  
 .Pc  
 is not preceded by white-space.  
 .  
 .Pp  
 If the input is  
 .Xr mdoc 7 ,  
 however, these rules are also applied to macro arguments when appropriate.  
 .  
 .  
 .Ss ASCII Output  .Ss ASCII Output
 Output produced by  Output produced by
 .Fl T Ns Ar ascii ,  .Fl T Ns Cm ascii ,
 which is the default, is rendered in standard 7-bit ASCII documented in  which is the default, is rendered in standard 7-bit ASCII documented in
 .Xr ascii 7 .  .Xr ascii 7 .
 .Pp  .Pp
Line 329  is rendered as
Line 219  is rendered as
 .Sq _ Ns \e[bs] Ns c ,  .Sq _ Ns \e[bs] Ns c ,
 where  where
 .Sq \e[bs]  .Sq \e[bs]
 is the back-space character number 8.  Emboldened characters are rendered as  is the back-space character number 8.
   Emboldened characters are rendered as
 .Sq c Ns \e[bs] Ns c .  .Sq c Ns \e[bs] Ns c .
 .Pp  .Pp
 The special characters documented in  The special characters documented in
Line 338  are rendered best-effort in an ASCII equivalent.
Line 229  are rendered best-effort in an ASCII equivalent.
 .Pp  .Pp
 Output width is limited to 78 visible columns unless literal input lines  Output width is limited to 78 visible columns unless literal input lines
 exceed this limit.  exceed this limit.
 .  .Pp
 .  The following
   .Fl O
   arguments are accepted:
   .Bl -tag -width Ds
   .It Cm width Ns = Ns Ar width
   The output width is set to
   .Ar width ,
   which will normalise to \(>=60.
   .El
 .Ss HTML Output  .Ss HTML Output
 Output produced by  Output produced by
 .Fl T Ns Ar html  .Fl T Ns Cm html
 conforms to HTML-4.01 strict.  conforms to HTML-4.01 strict.
 .Pp  .Pp
 Font styles and page structure are applied using CSS2.  By default, no  Font styles and page structure are applied using CSS2.
 font style is applied to any text, although CSS2 is hard-coded to format  By default, no font style is applied to any text,
   although CSS2 is hard-coded to format
 the basic structure of output.  the basic structure of output.
 .Pp  .Pp
 The  The
 .Pa example.style.css  .Pa example.style.css
 file documents the range of styles applied to output and, if used, will  file documents the range of styles applied to output and, if used, will
 cause rendered documents to appear as they do in  cause rendered documents to appear as they do in
 .Fl T Ns Ar ascii .  .Fl T Ns Cm ascii .
 .Pp  .Pp
 Special characters are rendered in decimal-encoded UTF-8.  Special characters are rendered in decimal-encoded UTF-8.
 .  .Pp
 .  The following
   .Fl O
   arguments are accepted:
   .Bl -tag -width Ds
   .It Cm includes Ns = Ns Ar fmt
   The string
   .Ar fmt ,
   for example,
   .Ar ../src/%I.html ,
   is used as a template for linked header files (usually via the
   .Sq \&In
   macro).
   Instances of
   .Sq \&%I
   are replaced with the include filename.
   The default is not to present a
   hyperlink.
   .It Cm man Ns = Ns Ar fmt
   The string
   .Ar fmt ,
   for example,
   .Ar ../html%S/%N.%S.html ,
   is used as a template for linked manuals (usually via the
   .Sq \&Xr
   macro).
   Instances of
   .Sq \&%N
   and
   .Sq %S
   are replaced with the linked manual's name and section, respectively.
   If no section is included, section 1 is assumed.
   The default is not to
   present a hyperlink.
   .It Cm style Ns = Ns Ar style.css
   The file
   .Ar style.css
   is used for an external style-sheet.
   This must be a valid absolute or
   relative URI.
   .El
   .Ss PostScript Output
   PostScript
   .Qq Adobe-3.0
   Level-2 pages may be generated by
   .Fl T Ns Cm ps .
   Output pages are US-letter sized and rendered in fixed, 10-point Courier
   font.
   .Pp
   Special characters are rendered as in
   .Sx ASCII Output .
   .Pp
   The following
   .Fl O
   arguments are accepted:
   .Bl -tag -width Ds
   .It Cm paper Ns = Ns Ar name
   The paper size
   .Ar name
   may be one of
   .Ar a4
   or
   .Ar letter .
   .El
 .Ss XHTML Output  .Ss XHTML Output
 Output produced by  Output produced by
 .Fl T Ns Ar xhtml  .Fl T Ns Cm xhtml
 conforms to XHTML-1.0 strict.  conforms to XHTML-1.0 strict.
 .Pp  .Pp
 See  See
 .Sx HTML Output  .Sx HTML Output
 for details; beyond generating XHTML tags instead of HTML tags, these  for details; beyond generating XHTML tags instead of HTML tags, these
 output modes are identical.  output modes are identical.
 .  
 .  
 .Sh EXAMPLES  .Sh EXAMPLES
 To page manuals to the terminal:  To page manuals to the terminal:
 .  
 .Pp  .Pp
 .D1 % mandoc \-Wall,error \-fstrict mandoc.1 2>&1 | less  .D1 $ mandoc \-Wall,error \-fstrict mandoc.1 2\*(Gt&1 | less
 .D1 % mandoc mandoc.1 mdoc.3 mdoc.7 | less  .D1 $ mandoc mandoc.1 mdoc.3 mdoc.7 | less
 .  
 .Pp  .Pp
 To produce HTML manuals with  To produce HTML manuals with
 .Ar style.css  .Ar style.css
 as the style-sheet:  as the style-sheet:
 .Pp  .Pp
 .D1 % mandoc \-Thtml -Ostyle=style.css mdoc.7 > mdoc.7.html  .D1 $ mandoc \-Thtml -Ostyle=style.css mdoc.7 \*(Gt mdoc.7.html
 .Pp  .Pp
 To check over a large set of manuals:  To check over a large set of manuals:
 .  
 .Pp  .Pp
 .Dl % mandoc \-Tlint \-fign-errors `find /usr/src -name \e*\e.[1-9]`  .Dl $ mandoc \-Tlint \-fign-errors `find /usr/src -name \e*\e.[1-9]`
 .  .Pp
 .  To produce a series of PostScript manuals for A4 paper:
   .Pp
   .D1 $ mandoc \-Tps \-Opaper=a4 mdoc.7 man.7 \*(Gt manuals.ps
 .Sh COMPATIBILITY  .Sh COMPATIBILITY
 This section summarises  This section summarises
 .Nm  .Nm
 compatibility with  compatibility with
 .Xr groff 1 .  .Xr groff 1 .
 Each input and output format is separately noted.  Each input and output format is separately noted.
 .  
 .  
 .Ss ASCII Compatibility  .Ss ASCII Compatibility
 .Bl -bullet -compact  .Bl -bullet -compact
 .It  .It
 The  The
 .Sq \e~  .Sq \e~
 special character doesn't produce expected behaviour in  special character doesn't produce expected behaviour in
 .Fl T Ns Ar ascii .  .Fl T Ns Cm ascii .
 .  
 .It  .It
 The  The
 .Sq \&Bd \-literal  .Sq \&Bd \-literal
Line 413  and
Line 369  and
 macros of  macros of
 .Xr mdoc 7  .Xr mdoc 7
 in  in
 .Fl T Ns Ar ascii  .Fl T Ns Cm ascii
 are synonyms, as are \-filled and \-ragged.  are synonyms, as are \-filled and \-ragged.
 .  
 .It  .It
 In  In
 .Xr groff 1 ,  .Xr groff 1 ,
Line 424  the
Line 379  the
 .Xr mdoc 7  .Xr mdoc 7
 macro does not underline when scoped under an  macro does not underline when scoped under an
 .Sq \&It  .Sq \&It
 in the FILES section.  This behaves correctly in  in the FILES section.
   This behaves correctly in
 .Nm .  .Nm .
 .  
 .It  .It
 A list or display following  A list or display following the
 .Sq \&Ss  .Sq \&Ss
 .Xr mdoc 7  .Xr mdoc 7
 macro in  macro in
 .Fl T Ns Ar ascii  .Fl T Ns Cm ascii
 does not assert a prior vertical break, just as it doesn't with  does not assert a prior vertical break, just as it doesn't with
 .Sq \&Sh .  .Sq \&Sh .
 .  
 .It  .It
 The  The
 .Sq \&na  .Sq \&na
 .Xr man 7  .Xr man 7
 macro in  macro in
 .Fl T Ns Ar ascii  .Fl T Ns Cm ascii
 has no effect.  has no effect.
 .  
 .It  .It
 Words aren't hyphenated.  Words aren't hyphenated.
 .  
 .It  .It
 In normal mode (not a literal block), blocks of spaces aren't preserved,  In normal mode (not a literal block), blocks of spaces aren't preserved,
 so double spaces following sentence closure are reduced to a single space;  so double spaces following sentence closure are reduced to a single space;
 .Xr groff 1  .Xr groff 1
 retains spaces.  retains spaces.
 .  
 .It  .It
 Sentences are unilaterally monospaced.  Sentences are unilaterally monospaced.
 .El  .El
 .  
 .  
 .Ss HTML/XHTML Compatibility  .Ss HTML/XHTML Compatibility
 .Bl -bullet -compact  .Bl -bullet -compact
 .It  .It
Line 466  The
Line 415  The
 escape will revert the font to the previous  escape will revert the font to the previous
 .Sq \ef  .Sq \ef
 escape, not to the last rendered decoration, which is now dictated by  escape, not to the last rendered decoration, which is now dictated by
 CSS instead of hard-coded.  It also will not span past the current  CSS instead of hard-coded.
 scope, for the same reason.  Note that in  It also will not span past the current scope,
   for the same reason.
   Note that in
 .Sx ASCII Output  .Sx ASCII Output
 mode, this will work fine.  mode, this will work fine.
 .It  .It
Line 478  and
Line 429  and
 .Sq \&Bl \-tag  .Sq \&Bl \-tag
 list types render similarly (no break following overreached left-hand  list types render similarly (no break following overreached left-hand
 side) due to the expressive constraints of HTML.  side) due to the expressive constraints of HTML.
 .  
 .It  .It
 The  The
 .Xr man 7  .Xr man 7
Line 487  and
Line 437  and
 .Sq TP  .Sq TP
 lists render similarly.  lists render similarly.
 .El  .El
 .  
 .  
 .Sh SEE ALSO  .Sh SEE ALSO
   .Xr man 7 ,
 .Xr mandoc_char 7 ,  .Xr mandoc_char 7 ,
 .Xr mdoc 7 ,  .Xr mdoc 7
 .Xr man 7  
 .  
 .Sh AUTHORS  .Sh AUTHORS
 The  The
 .Nm  .Nm
 utility was written by  utility was written by
 .An Kristaps Dzonsons Aq kristaps@kth.se .  .An Kristaps Dzonsons Aq kristaps@bsd.lv .
 .  
 .  
 .Sh CAVEATS  .Sh CAVEATS
 The  The
 .Fl T Ns Ar html  .Fl T Ns Cm html
 and  and
 .Fl T Ns Ar xhtml  .Fl T Ns Cm xhtml
 CSS2 styling used for  CSS2 styling used for
 .Fl m Ns Ar doc  .Fl m Ns Cm doc
 input lists does not render properly in older browsers, such as Internet  input lists does not render properly in older browsers, such as Internet
 Explorer 6 and earlier.  Explorer 6 and earlier.
 .Pp  .Pp
 In  In
 .Fl T Ns Ar html  .Fl T Ns Cm html
 and  and
 .Fl T Ns Ar xhtml ,  .Fl T Ns Cm xhtml ,
 the maximum size of an element attribute is determined by  the maximum size of an element attribute is determined by
 .Dv BUFSIZ ,  .Dv BUFSIZ ,
 which is usually 1024 bytes.  Be aware of this when setting long link  which is usually 1024 bytes.
 formats, e.g.,  Be aware of this when setting long link
 .Fl O Ns Ar style=really/long/link .  formats such as
   .Fl O Ns Cm style Ns = Ns Ar really/long/link .
 .Pp  .Pp
 The  The
 .Fl T Ns Ar html  .Fl T Ns Cm html
 and  and
 .Fl T Ns Ar xhtml  .Fl T Ns Cm xhtml
 output modes don't render the  output modes don't render the
 .Sq \es  .Sq \es
 font size escape documented in  font size escape documented in
Line 533  and
Line 479  and
 .Xr man 7 .  .Xr man 7 .
 .Pp  .Pp
 Nesting elements within next-line element scopes of  Nesting elements within next-line element scopes of
 .Fl m Ns Ar an ,  .Fl m Ns Cm an ,
 such as  such as
 .Sq br  .Sq br
 within an empty  within an empty
 .Sq B ,  .Sq B ,
 will confuse  will confuse
 .Fl T Ns Ar html  .Fl T Ns Cm html
 and  and
 .Fl T Ns Ar xhtml  .Fl T Ns Cm xhtml
 and cause them to forget the formatting of the prior next-line scope.  and cause them to forget the formatting of the prior next-line scope.
 .Pp  .Pp
 The  The
 .Sq i  .Sq i
 macro in  macro in
 .Fl m Ns Ar an  .Fl m Ns Cm an
 should italicise all subsequent text if a line argument is not provided.  should italicise all subsequent text if a line argument is not provided.
 This behaviour is not implemented.  This behaviour is not implemented.
   The
   .Sq \(aq
   control character is an alias for the standard macro control character
   and does not emit a line-break as stipulated in GNU troff.
Legend:
Removed from v.1.53  
changed lines
  Added in v.1.66
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