Drop explicit, constant style=margin-left attribute on .Bf blocks.

[mandoc.git] / man.7

diff --git a/man.7 b/man.7
index 496f7650b000d6c106cd6166d721d3f2de8ffdca..d418b9ee76caf7db211526043b0a652c7938c66a 100644 (file)
--- a/man.7
+++ b/man.7
@@ -1,7 +1,8 @@
-.\"    $Id: man.7,v 1.111 2011/09/26 23:07:31 schwarze Exp $
+.\"    $Id: man.7,v 1.137 2018/04/05 22:12:33 schwarze Exp $

 .\"
 .\"

-.\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
-.\" Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org>
+.\" Copyright (c) 2009, 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
+.\" Copyright (c) 2011-2015 Ingo Schwarze <schwarze@openbsd.org>
+.\" Copyright (c) 2010 Joerg Sonnenberger <joerg@netbsd.org>

 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above
 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above


@@ -15,7 +16,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"

-.Dd $Mdocdate: September 26 2011 $
+.Dd $Mdocdate: April 5 2018 $

 .Dt MAN 7
 .Os
 .Sh NAME
 .Dt MAN 7
 .Os
 .Sh NAME


@@ -97,30 +98,32 @@ file for a utility
 .Bd -literal -offset indent
 \&.TH PROGNAME 1 2009-10-10
 \&.SH NAME
 .Bd -literal -offset indent
 \&.TH PROGNAME 1 2009-10-10
 \&.SH NAME

-\efBprogname\efR \e(en a description goes here
+\efBprogname\efR \e(en one line about what it does

 \&.\e\(dq .SH LIBRARY
 \&.\e\(dq .SH LIBRARY

-\&.\e\(dq For sections 2 & 3 only.
+\&.\e\(dq For sections 2, 3, and 9 only.

 \&.\e\(dq Not used in OpenBSD.
 \&.SH SYNOPSIS
 \&.\e\(dq Not used in OpenBSD.
 \&.SH SYNOPSIS

-\efBprogname\efR [\efB\e-options\efR] arguments...
+\efBprogname\efR [\efB\e-options\efR] \efIfile ...\efR

 \&.SH DESCRIPTION
 \&.SH DESCRIPTION

-The \efBfoo\efR utility processes files...
+The \efBfoo\efR utility processes files ...
+\&.\e\(dq .Sh CONTEXT
+\&.\e\(dq For section 9 functions only.

 \&.\e\(dq .SH IMPLEMENTATION NOTES
 \&.\e\(dq Not used in OpenBSD.
 \&.\e\(dq .SH RETURN VALUES
 \&.\e\(dq .SH IMPLEMENTATION NOTES
 \&.\e\(dq Not used in OpenBSD.
 \&.\e\(dq .SH RETURN VALUES

-\&.\e\(dq For sections 2, 3, & 9 only.
+\&.\e\(dq For sections 2, 3, and 9 function return values only.

 \&.\e\(dq .SH ENVIRONMENT
 \&.\e\(dq .SH ENVIRONMENT

-\&.\e\(dq For sections 1, 6, 7, & 8 only.
+\&.\e\(dq For sections 1, 6, 7, and 8 only.

 \&.\e\(dq .SH FILES
 \&.\e\(dq .SH EXIT STATUS
 \&.\e\(dq .SH FILES
 \&.\e\(dq .SH EXIT STATUS

-\&.\e\(dq For sections 1, 6, & 8 only.
+\&.\e\(dq For sections 1, 6, and 8 only.

 \&.\e\(dq .SH EXAMPLES
 \&.\e\(dq .SH DIAGNOSTICS
 \&.\e\(dq .SH EXAMPLES
 \&.\e\(dq .SH DIAGNOSTICS

-\&.\e\(dq For sections 1, 4, 6, 7, & 8 only.
+\&.\e\(dq For sections 1, 4, 6, 7, 8, and 9 printf/stderr messages only.

 \&.\e\(dq .SH ERRORS
 \&.\e\(dq .SH ERRORS

-\&.\e\(dq For sections 2, 3, & 9 only.
+\&.\e\(dq For sections 2, 3, 4, and 9 errno settings only.

 \&.\e\(dq .SH SEE ALSO
 \&.\e\(dq .SH SEE ALSO

-\&.\e\(dq .BR foo ( 1 )
+\&.\e\(dq .BR foobar ( 1 )

 \&.\e\(dq .SH STANDARDS
 \&.\e\(dq .SH HISTORY
 \&.\e\(dq .SH AUTHORS
 \&.\e\(dq .SH STANDARDS
 \&.\e\(dq .SH HISTORY
 \&.\e\(dq .SH AUTHORS


@@ -170,6 +173,9 @@ This expands upon the brief, one-line description in
 .Em NAME .
 It usually contains a break-down of the options (if documenting a
 command).
 .Em NAME .
 It usually contains a break-down of the options (if documenting a
 command).

+.It Em CONTEXT
+This section lists the contexts in which functions can be called in section 9.
+The contexts are autoconf, process, or interrupt.

 .It Em IMPLEMENTATION NOTES
 Implementation-specific notes should be kept here.
 This is useful when implementing standard functions that may have side
 .It Em IMPLEMENTATION NOTES
 Implementation-specific notes should be kept here.
 This is useful when implementing standard functions that may have side


@@ -196,13 +202,19 @@ well-tested invocations.
 Make sure that examples work properly!
 .It Em DIAGNOSTICS
 Documents error conditions.
 Make sure that examples work properly!
 .It Em DIAGNOSTICS
 Documents error conditions.

-This is most useful in section 4 manuals.
+In section 4 and 9 manuals, these are usually messages
+printed by the kernel to the console and to the kernel log.
+In section 1, 6, 7, and 8, these are usually messages
+printed by userland programs to the standard error output.
+.Pp

 Historically, this section was used in place of
 .Em EXIT STATUS
 for manuals in sections 1, 6, and 8; however, this practise is
 discouraged.
 .It Em ERRORS
 Historically, this section was used in place of
 .Em EXIT STATUS
 for manuals in sections 1, 6, and 8; however, this practise is
 discouraged.
 .It Em ERRORS

-Documents error handling in sections 2, 3, and 9.
+Documents
+.Xr errno 2
+settings in sections 2, 3, 4, and 9.

 .It Em SEE ALSO
 References other manuals with related topics.
 This section should exist for most manuals.
 .It Em SEE ALSO
 References other manuals with related topics.
 This section should exist for most manuals.


@@ -253,8 +265,7 @@ in the alphabetical reference below.
 .It Sx IP Ta indented paragraph: Op Ar head Op Ar width
 .It Sx TP Ta tagged paragraph: Op Ar width
 .It Sx HP Ta hanged paragraph: Op Ar width
 .It Sx IP Ta indented paragraph: Op Ar head Op Ar width
 .It Sx TP Ta tagged paragraph: Op Ar width
 .It Sx HP Ta hanged paragraph: Op Ar width

-.It Sx \&br Ta force output line break in text mode (no arguments)
-.It Sx \&sp Ta force vertical space: Op Ar height
+.It Sx PD Ta set vertical paragraph distance: Op Ar height

 .It Sx fi , nf Ta fill mode and no-fill mode (no arguments)
 .It Sx in Ta additional indent: Op Ar width
 .El
 .It Sx fi , nf Ta fill mode and no-fill mode (no arguments)
 .It Sx in Ta additional indent: Op Ar width
 .El


@@ -262,7 +273,6 @@ in the alphabetical reference below.
 .Bl -column "PP, LP, P" description
 .It Sx B Ta boldface font
 .It Sx I Ta italic font
 .Bl -column "PP, LP, P" description
 .It Sx B Ta boldface font
 .It Sx I Ta italic font

-.It Sx R Ta roman (default) font

 .It Sx SB Ta small boldface font
 .It Sx SM Ta small roman font
 .It Sx BI Ta alternate between boldface and italic fonts
 .It Sx SB Ta small boldface font
 .It Sx SM Ta small roman font
 .It Sx BI Ta alternate between boldface and italic fonts


@@ -279,16 +289,14 @@ For the scoping of individual macros, see
 .Sx MACRO SYNTAX .
 .Ss \&AT
 Sets the volume for the footer for compatibility with man pages from
 .Sx MACRO SYNTAX .
 .Ss \&AT
 Sets the volume for the footer for compatibility with man pages from

-.Tn AT&T UNIX
+.At

 releases.
 The optional arguments specify which release it is from.
 .Ss \&B
 Text is rendered in bold face.
 .Pp
 See also
 releases.
 The optional arguments specify which release it is from.
 .Ss \&B
 Text is rendered in bold face.
 .Pp
 See also

-.Sx \&I
-and
-.Sx \&R .
+.Sx \&I .

 .Ss \&BI
 Text is rendered alternately in bold face and italic.
 Thus,
 .Ss \&BI
 Text is rendered alternately in bold face and italic.
 Thus,


@@ -337,20 +345,37 @@ See also
 and
 .Sx \&IR .
 .Ss \&DT
 and
 .Sx \&IR .
 .Ss \&DT

-Has no effect.
-Included for compatibility.
+Restore the default tabulator positions.
+They are at intervals of 0.5 inches.
+This has no effect unless the tabulator positions were changed with the
+.Xr roff 7
+.Ic \&ta
+request.
+.Ss \&EE
+This is a non-standard GNU extension, included only for compatibility.
+In
+.Xr mandoc 1 ,
+it does the same as
+.Sx \&fi .
+.Ss \&EX
+This is a non-standard GNU extension, included only for compatibility.
+In
+.Xr mandoc 1 ,
+it does the same as
+.Sx \&nf .

 .Ss \&HP
 Begin a paragraph whose initial output line is left-justified, but
 subsequent output lines are indented, with the following syntax:
 .Bd -filled -offset indent
 .Pf \. Sx \&HP
 .Ss \&HP
 Begin a paragraph whose initial output line is left-justified, but
 subsequent output lines are indented, with the following syntax:
 .Bd -filled -offset indent
 .Pf \. Sx \&HP

-.Op Cm width
+.Op Ar width

 .Ed
 .Pp
 The
 .Ed
 .Pp
 The

-.Cm width
-argument must conform to
-.Sx Scaling Widths .
+.Ar width
+argument is a
+.Xr roff 7
+scaling width.

 If specified, it's saved for later paragraph left-margins; if unspecified, the
 saved or default width is used.
 .Pp
 If specified, it's saved for later paragraph left-margins; if unspecified, the
 saved or default width is used.
 .Pp


@@ -365,9 +390,7 @@ and
 Text is rendered in italics.
 .Pp
 See also
 Text is rendered in italics.
 .Pp
 See also

-.Sx \&B
-and
-.Sx \&R .
+.Sx \&B .

 .Ss \&IB
 Text is rendered alternately in italics and bold face.
 Whitespace between arguments is omitted in output.
 .Ss \&IB
 Text is rendered alternately in italics and bold face.
 Whitespace between arguments is omitted in output.


@@ -387,18 +410,19 @@ and
 Begin an indented paragraph with the following syntax:
 .Bd -filled -offset indent
 .Pf \. Sx \&IP
 Begin an indented paragraph with the following syntax:
 .Bd -filled -offset indent
 .Pf \. Sx \&IP

-.Op Cm head Op Cm width
+.Op Ar head Op Ar width

 .Ed
 .Pp
 The
 .Ed
 .Pp
 The

-.Cm width
-argument defines the width of the left margin and is defined by
-.Sx Scaling Widths .
+.Ar width
+argument is a
+.Xr roff 7
+scaling width defining the left margin.

 It's saved for later paragraph left-margins; if unspecified, the saved or
 default width is used.
 .Pp
 The
 It's saved for later paragraph left-margins; if unspecified, the saved or
 default width is used.
 .Pp
 The

-.Cm head
+.Ar head

 argument is used as a leading term, flushed to the left margin.
 This is useful for bulleted paragraphs and so on.
 .Pp
 argument is used as a leading term, flushed to the left margin.
 This is useful for bulleted paragraphs and so on.
 .Pp


@@ -437,6 +461,34 @@ See also
 .Sx \&PP ,
 and
 .Sx \&TP .
 .Sx \&PP ,
 and
 .Sx \&TP .

+.Ss \&ME
+End a mailto block.
+This is a non-standard GNU extension, included only for compatibility.
+See
+.Sx \&MT .
+.Ss \&MT
+Begin a mailto block.
+This is a non-standard GNU extension, included only for compatibility.
+It has the following syntax:
+.Bd -literal -offset indent
+.Pf \. Sx \&MT Ar address
+link description to be shown
+.Pf \. Sx ME
+.Ed
+.Ss \&OP
+Optional command-line argument.
+This is a non-standard GNU extension, included only for compatibility.
+It has the following syntax:
+.Bd -filled -offset indent
+.Pf \. Sx \&OP
+.Ar key Op Ar value
+.Ed
+.Pp
+The
+.Ar key
+is usually a command-line flag and
+.Ar value
+its argument.

 .Ss \&P
 Synonym for
 .Sx \&LP .
 .Ss \&P
 Synonym for
 .Sx \&LP .


@@ -448,6 +500,36 @@ See also
 .Sx \&PP ,
 and
 .Sx \&TP .
 .Sx \&PP ,
 and
 .Sx \&TP .

+.Ss \&PD
+Specify the vertical space to be inserted before each new paragraph.
+.br
+The syntax is as follows:
+.Bd -filled -offset indent
+.Pf \. Sx \&PD
+.Op Ar height
+.Ed
+.Pp
+The
+.Ar height
+argument is a
+.Xr roff 7
+scaling width.
+It defaults to
+.Cm 1v .
+If the unit is omitted,
+.Cm v
+is assumed.
+.Pp
+This macro affects the spacing before any subsequent instances of
+.Sx \&HP ,
+.Sx \&IP ,
+.Sx \&LP ,
+.Sx \&P ,
+.Sx \&PP ,
+.Sx \&SH ,
+.Sx \&SS ,
+and
+.Sx \&TP .

 .Ss \&PP
 Synonym for
 .Sx \&LP .
 .Ss \&PP
 Synonym for
 .Sx \&LP .


@@ -459,13 +541,6 @@ See also
 .Sx \&P ,
 and
 .Sx \&TP .
 .Sx \&P ,
 and
 .Sx \&TP .

-.Ss \&R
-Text is rendered in roman (the default font).
-.Pp
-See also
-.Sx \&I
-and
-.Sx \&B .

 .Ss \&RB
 Text is rendered alternately in roman (the default font) and bold face.
 Whitespace between arguments is omitted in output.
 .Ss \&RB
 Text is rendered alternately in roman (the default font) and bold face.
 Whitespace between arguments is omitted in output.


@@ -484,9 +559,29 @@ and
 .Ss \&RE
 Explicitly close out the scope of a prior
 .Sx \&RS .
 .Ss \&RE
 Explicitly close out the scope of a prior
 .Sx \&RS .

-The default left margin is restored to the state of the original
+The default left margin is restored to the state before that

 .Sx \&RS
 invocation.
 .Sx \&RS
 invocation.

+.Pp
+The syntax is as follows:
+.Bd -filled -offset indent
+.Pf \. Sx \&RE
+.Op Ar level
+.Ed
+.Pp
+Without an argument, the most recent
+.Sx \&RS
+block is closed out.
+If
+.Ar level
+is 1, all open
+.Sx \&RS
+blocks are closed out.
+Otherwise,
+.Ar level No \(mi 1
+nested
+.Sx \&RS
+blocks remain open.

 .Ss \&RI
 Text is rendered alternately in roman (the default font) and italics.
 Whitespace between arguments is omitted in output.
 .Ss \&RI
 Text is rendered alternately in roman (the default font) and italics.
 Whitespace between arguments is omitted in output.


@@ -507,13 +602,14 @@ Temporarily reset the default left margin.
 This has the following syntax:
 .Bd -filled -offset indent
 .Pf \. Sx \&RS
 This has the following syntax:
 .Bd -filled -offset indent
 .Pf \. Sx \&RS

-.Op Cm width
+.Op Ar width

 .Ed
 .Pp
 The
 .Ed
 .Pp
 The

-.Cm width
-argument must conform to
-.Sx Scaling Widths .
+.Ar width
+argument is a
+.Xr roff 7
+scaling width.

 If not specified, the saved or default width is used.
 .Pp
 See also
 If not specified, the saved or default width is used.
 .Pp
 See also


@@ -535,7 +631,8 @@ The scope of a sub-section is closed by a subsequent sub-section,
 section, or end of file.
 The paragraph left-margin width is reset to the default.
 .Ss \&TH
 section, or end of file.
 The paragraph left-margin width is reset to the default.
 .Ss \&TH

-Sets the title of the manual page with the following syntax:
+Sets the title of the manual page for use in the page header
+and footer with the following syntax:

 .Bd -filled -offset indent
 .Pf \. Sx \&TH
 .Ar title section date
 .Bd -filled -offset indent
 .Pf \. Sx \&TH
 .Ar title section date


@@ -557,6 +654,11 @@ is empty or not specified, the current date is used.
 The optional
 .Ar source
 string specifies the organisation providing the utility.
 The optional
 .Ar source
 string specifies the organisation providing the utility.

+When unspecified,
+.Xr mandoc 1
+uses its
+.Fl Ios
+argument.

 The
 .Ar volume
 string replaces the default rendered volume, which is dictated by the
 The
 .Ar volume
 string replaces the default rendered volume, which is dictated by the


@@ -573,13 +675,14 @@ Subsequent output lines are indented.
 The syntax is as follows:
 .Bd -filled -offset indent
 .Pf \. Sx \&TP
 The syntax is as follows:
 .Bd -filled -offset indent
 .Pf \. Sx \&TP

-.Op Cm width
+.Op Ar width

 .Ed
 .Pp
 The
 .Ed
 .Pp
 The

-.Cm width
-argument must conform to
-.Sx Scaling Widths .
+.Ar width
+argument is a
+.Xr roff 7
+scaling width.

 If specified, it's saved for later paragraph left-margins; if
 unspecified, the saved or default width is used.
 .Pp
 If specified, it's saved for later paragraph left-margins; if
 unspecified, the saved or default width is used.
 .Pp


@@ -592,34 +695,36 @@ and
 .Sx \&PP .
 .Ss \&UC
 Sets the volume for the footer for compatibility with man pages from
 .Sx \&PP .
 .Ss \&UC
 Sets the volume for the footer for compatibility with man pages from

-BSD releases.
+.Bx
+releases.

 The optional first argument specifies which release it is from.
 The optional first argument specifies which release it is from.

-.Ss \&br
-Breaks the current line.
-Consecutive invocations have no further effect.
-.Pp
-See also
-.Sx \&sp .
+.Ss \&UE
+End a uniform resource identifier block.
+This is a non-standard GNU extension, included only for compatibility.
+See
+.Sx \&UE .
+.Ss \&UR
+Begin a uniform resource identifier block.
+This is a non-standard GNU extension, included only for compatibility.
+It has the following syntax:
+.Bd -literal -offset indent
+.Pf \. Sx \&UR Ar uri
+link description to be shown
+.Pf \. Sx UE
+.Ed

 .Ss \&fi
 End literal mode begun by
 .Sx \&nf .
 .Ss \&fi
 End literal mode begun by
 .Sx \&nf .

-.Ss \&ft
-Change the current font mode.
-See
-.Sx Text Decoration
-for a listing of available font modes.

 .Ss \&in
 Indent relative to the current indentation:
 .Pp
 .Ss \&in
 Indent relative to the current indentation:
 .Pp

-.D1 Pf \. Sx \&in Op Cm width
+.D1 Pf \. Sx \&in Op Ar width

 .Pp
 If
 .Pp
 If

-.Cm width
+.Ar width

 is signed, the new offset is relative.
 Otherwise, it is absolute.
 This value is reset upon the next paragraph, section, or sub-section.
 is signed, the new offset is relative.
 Otherwise, it is absolute.
 This value is reset upon the next paragraph, section, or sub-section.

-.Ss \&na
-Don't align to the right margin.

 .Ss \&nf
 Begin literal mode: all subsequent free-form lines have their end of
 line boundaries preserved.
 .Ss \&nf
 Begin literal mode: all subsequent free-form lines have their end of
 line boundaries preserved.


@@ -629,24 +734,6 @@ Literal mode is implicitly ended by
 .Sx \&SH
 or
 .Sx \&SS .
 .Sx \&SH
 or
 .Sx \&SS .

-.Ss \&sp
-Insert vertical spaces into output with the following syntax:
-.Bd -filled -offset indent
-.Pf \. Sx \&sp
-.Op Cm height
-.Ed
-.Pp
-Insert
-.Cm height
-spaces, which must conform to
-.Sx Scaling Widths .
-If 0, this is equivalent to the
-.Sx \&br
-macro.
-Defaults to 1, if unspecified.
-.Pp
-See also
-.Sx \&br .

 .Sh MACRO SYNTAX
 The
 .Nm
 .Sh MACRO SYNTAX
 The
 .Nm


@@ -670,11 +757,7 @@ is equivalent to
 .Sq \&.I foo .
 If next-line macros are invoked consecutively, only the last is used.
 If a next-line macro is followed by a non-next-line macro, an error is
 .Sq \&.I foo .
 If next-line macros are invoked consecutively, only the last is used.
 If a next-line macro is followed by a non-next-line macro, an error is

-raised, except for
-.Sx \&br ,
-.Sx \&sp ,
-and
-.Sx \&na .
+raised.

 .Pp
 The syntax is as follows:
 .Bd -literal -offset indent
 .Pp
 The syntax is as follows:
 .Bd -literal -offset indent


@@ -688,23 +771,22 @@ The syntax is as follows:
 .It Sx \&BI  Ta    n         Ta    current   Ta    \&
 .It Sx \&BR  Ta    n         Ta    current   Ta    \&
 .It Sx \&DT  Ta    0         Ta    current   Ta    \&
 .It Sx \&BI  Ta    n         Ta    current   Ta    \&
 .It Sx \&BR  Ta    n         Ta    current   Ta    \&
 .It Sx \&DT  Ta    0         Ta    current   Ta    \&

+.It Sx \&EE  Ta    0         Ta    current   Ta    compat
+.It Sx \&EX  Ta    0         Ta    current   Ta    compat

 .It Sx \&I   Ta    n         Ta    next-line Ta    \&
 .It Sx \&IB  Ta    n         Ta    current   Ta    \&
 .It Sx \&IR  Ta    n         Ta    current   Ta    \&
 .It Sx \&I   Ta    n         Ta    next-line Ta    \&
 .It Sx \&IB  Ta    n         Ta    current   Ta    \&
 .It Sx \&IR  Ta    n         Ta    current   Ta    \&

-.It Sx \&R   Ta    n         Ta    next-line Ta    \&
+.It Sx \&OP  Ta    0, 1      Ta    current   Ta    compat
+.It Sx \&PD  Ta    1         Ta    current   Ta    \&

 .It Sx \&RB  Ta    n         Ta    current   Ta    \&
 .It Sx \&RI  Ta    n         Ta    current   Ta    \&
 .It Sx \&SB  Ta    n         Ta    next-line Ta    \&
 .It Sx \&SM  Ta    n         Ta    next-line Ta    \&
 .It Sx \&TH  Ta    >1, <6    Ta    current   Ta    \&
 .It Sx \&UC  Ta    <=1       Ta    current   Ta    \&
 .It Sx \&RB  Ta    n         Ta    current   Ta    \&
 .It Sx \&RI  Ta    n         Ta    current   Ta    \&
 .It Sx \&SB  Ta    n         Ta    next-line Ta    \&
 .It Sx \&SM  Ta    n         Ta    next-line Ta    \&
 .It Sx \&TH  Ta    >1, <6    Ta    current   Ta    \&
 .It Sx \&UC  Ta    <=1       Ta    current   Ta    \&

-.It Sx \&br  Ta    0         Ta    current   Ta    compat

 .It Sx \&fi  Ta    0         Ta    current   Ta    compat
 .It Sx \&fi  Ta    0         Ta    current   Ta    compat

-.It Sx \&ft  Ta    1         Ta    current   Ta    compat

 .It Sx \&in  Ta    1         Ta    current   Ta    compat
 .It Sx \&in  Ta    1         Ta    current   Ta    compat

-.It Sx \&na  Ta    0         Ta    current   Ta    compat

 .It Sx \&nf  Ta    0         Ta    current   Ta    compat
 .It Sx \&nf  Ta    0         Ta    current   Ta    compat

-.It Sx \&sp  Ta    1         Ta    current   Ta    compat

 .El
 .Pp
 Macros marked as
 .El
 .Pp
 Macros marked as


@@ -760,6 +842,8 @@ implicitly closed, is syntactically incorrect.
 .It Sx \&SH  Ta    >0        Ta    next-line  Ta    section     Ta    \&
 .It Sx \&SS  Ta    >0        Ta    next-line  Ta    sub-section Ta    \&
 .It Sx \&TP  Ta    n         Ta    next-line  Ta    paragraph   Ta    \&
 .It Sx \&SH  Ta    >0        Ta    next-line  Ta    section     Ta    \&
 .It Sx \&SS  Ta    >0        Ta    next-line  Ta    sub-section Ta    \&
 .It Sx \&TP  Ta    n         Ta    next-line  Ta    paragraph   Ta    \&

+.It Sx \&UE  Ta    0         Ta    current    Ta    none        Ta    compat
+.It Sx \&UR  Ta    1         Ta    current    Ta    part        Ta    compat

 .El
 .Pp
 Macros marked
 .El
 .Pp
 Macros marked


@@ -784,63 +868,6 @@ until the end of the macro scope.
 Note that macros like
 .Sx \&BR
 open and close a font scope for each argument.
 Note that macros like
 .Sx \&BR
 open and close a font scope for each argument.

-.Sh COMPATIBILITY
-This section documents areas of questionable portability between
-implementations of the
-.Nm
-language.
-.Pp
-.Bl -dash -compact
-.It
-Do not depend on
-.Sx \&SH
-or
-.Sx \&SS
-to close out a literal context opened with
-.Sx \&nf .
-This behaviour may not be portable.
-.It
-In quoted literals, GNU troff allowed pair-wise double-quotes to produce
-a standalone double-quote in formatted output.
-It is not known whether this behaviour is exhibited by other formatters.
-.It
-troff suppresses a newline before
-.Sq \(aq
-macro output; in mandoc, it is an alias for the standard
-.Sq \&.
-control character.
-.It
-The
-.Sq \eh
-.Pq horizontal position ,
-.Sq \ev
-.Pq vertical position ,
-.Sq \em
-.Pq text colour ,
-.Sq \eM
-.Pq text filling colour ,
-.Sq \ez
-.Pq zero-length character ,
-.Sq \ew
-.Pq string length ,
-.Sq \ek
-.Pq horizontal position marker ,
-.Sq \eo
-.Pq text overstrike ,
-and
-.Sq \es
-.Pq text size
-escape sequences are all discarded in mandoc.
-.It
-The
-.Sq \ef
-scaling unit is accepted by mandoc, but rendered as the default unit.
-.It
-The
-.Sx \&sp
-macro does not accept negative values in mandoc.
-In GNU troff, this would result in strange behaviour.
-.El

 .Sh SEE ALSO
 .Xr man 1 ,
 .Xr mandoc 1 ,
 .Sh SEE ALSO
 .Xr man 1 ,
 .Xr mandoc 1 ,


@@ -856,6 +883,9 @@ language first appeared as a macro package for the roff typesetting
 system in
 .At v7 .
 It was later rewritten by James Clark as a macro package for groff.
 system in
 .At v7 .
 It was later rewritten by James Clark as a macro package for groff.

+Eric S. Raymond wrote the extended
+.Nm
+macros for groff in 2007.

 The stand-alone implementation that is part of the
 .Xr mandoc 1
 utility written by Kristaps Dzonsons appeared in
 The stand-alone implementation that is part of the
 .Xr mandoc 1
 utility written by Kristaps Dzonsons appeared in


@@ -864,8 +894,7 @@ utility written by Kristaps Dzonsons appeared in
 This
 .Nm
 reference was written by
 This
 .Nm
 reference was written by

-.An Kristaps Dzonsons ,
-.Mt kristaps@bsd.lv .
+.An Kristaps Dzonsons Aq Mt kristaps@bsd.lv .

 .Sh CAVEATS
 Do not use this language.
 Use
 .Sh CAVEATS
 Do not use this language.
 Use