Yet another round of improvements to manual font selection.

Unify handling of \f and .ft.
Support \f4 (bold+italic).
Support ".ft BI" and ".ft CW" for terminal output.
Support the .ft request in HTML output.
Reject the bogus fonts \f(C1, \f(C2, \f(C3, and \f(CP.
In regress.pl, only strip leading whitespace in math mode.

23 files changed, 252 insertions, 163 deletions

diff --git a/Makefile.depend b/Makefile.depend
index 827b4763..5817765c 100644
--- a/Makefile.depend
+++ b/Makefile.depend
@@ -34,7 +34,7 @@ html.o: html.c config.h mandoc_aux.h mandoc_ohash.h compat_ohash.h mandoc.h roff
 lib.o: lib.c config.h roff.h libmdoc.h lib.in
 main.o: main.c config.h mandoc_aux.h mandoc.h mandoc_xr.h roff.h mdoc.h man.h mandoc_parse.h tag.h main.h manconf.h mansearch.h
 man.o: man.c config.h mandoc_aux.h mandoc.h roff.h man.h libmandoc.h roff_int.h libman.h
-man_html.o: man_html.c config.h mandoc_aux.h roff.h man.h out.h html.h main.h
+man_html.o: man_html.c config.h mandoc_aux.h mandoc.h roff.h man.h out.h html.h main.h
 man_macro.o: man_macro.c config.h mandoc.h roff.h man.h libmandoc.h roff_int.h libman.h
 man_term.o: man_term.c config.h mandoc_aux.h roff.h man.h out.h term.h main.h
 man_validate.o: man_validate.c config.h mandoc_aux.h mandoc.h roff.h man.h libmandoc.h roff_int.h libman.h
@@ -49,7 +49,7 @@ manpath.o: manpath.c config.h mandoc_aux.h manconf.h
 mansearch.o: mansearch.c config.h mandoc_aux.h mandoc_ohash.h compat_ohash.h manconf.h mansearch.h dbm.h
 mdoc.o: mdoc.c config.h mandoc_aux.h mandoc.h roff.h mdoc.h libmandoc.h roff_int.h libmdoc.h
 mdoc_argv.o: mdoc_argv.c config.h mandoc_aux.h mandoc.h roff.h mdoc.h libmandoc.h roff_int.h libmdoc.h
-mdoc_html.o: mdoc_html.c config.h mandoc_aux.h roff.h mdoc.h out.h html.h main.h
+mdoc_html.o: mdoc_html.c config.h mandoc_aux.h mandoc.h roff.h mdoc.h out.h html.h main.h
 mdoc_macro.o: mdoc_macro.c config.h mandoc.h roff.h mdoc.h libmandoc.h roff_int.h libmdoc.h
 mdoc_man.o: mdoc_man.c config.h mandoc_aux.h mandoc.h roff.h mdoc.h man.h out.h main.h
 mdoc_markdown.o: mdoc_markdown.c mandoc_aux.h mandoc.h roff.h mdoc.h main.h
@@ -61,7 +61,7 @@ out.o: out.c config.h mandoc_aux.h tbl.h out.h
 preconv.o: preconv.c config.h mandoc.h roff.h mandoc_parse.h libmandoc.h
 read.o: read.c config.h mandoc_aux.h mandoc.h roff.h mdoc.h man.h mandoc_parse.h libmandoc.h roff_int.h
 roff.o: roff.c config.h mandoc_aux.h mandoc_ohash.h compat_ohash.h mandoc.h roff.h mandoc_parse.h libmandoc.h roff_int.h tbl_parse.h eqn_parse.h predefs.in
-roff_html.o: roff_html.c roff.h out.h html.h
+roff_html.o: roff_html.c mandoc.h roff.h out.h html.h
 roff_term.o: roff_term.c mandoc.h roff.h out.h term.h
 roff_validate.o: roff_validate.c mandoc.h roff.h libmandoc.h roff_int.h
 soelim.o: soelim.c config.h compat_stringlist.h
@@ -69,7 +69,7 @@ st.o: st.c config.h mandoc.h roff.h libmdoc.h
 tag.o: tag.c config.h mandoc_aux.h mandoc_ohash.h compat_ohash.h tag.h
 tbl.o: tbl.c config.h mandoc_aux.h mandoc.h tbl.h libmandoc.h tbl_parse.h tbl_int.h
 tbl_data.o: tbl_data.c config.h mandoc_aux.h mandoc.h tbl.h libmandoc.h tbl_int.h
-tbl_html.o: tbl_html.c config.h tbl.h out.h html.h
+tbl_html.o: tbl_html.c config.h mandoc.h tbl.h out.h html.h
 tbl_layout.o: tbl_layout.c config.h mandoc_aux.h mandoc.h tbl.h libmandoc.h tbl_int.h
 tbl_opts.o: tbl_opts.c config.h mandoc.h tbl.h libmandoc.h tbl_int.h
 tbl_term.o: tbl_term.c config.h mandoc.h tbl.h out.h term.h
diff --git a/html.c b/html.c
index 010eac68..4d4dacf3 100644
--- a/html.c
+++ b/html.c
@@ -117,7 +117,6 @@ static	void	 print_ctag(struct html *, struct tag *);
 static	int	 print_escape(struct html *, char);
 static	int	 print_encode(struct html *, const char *, const char *, int);
 static	void	 print_href(struct html *, const char *, const char *, int);
-static	void	 print_metaf(struct html *, enum mandoc_esc);
 
 
 void *
@@ -210,7 +209,7 @@ print_gen_head(struct html *h)
 	print_tagq(h, t);
 }
 
-static void
+void
 print_metaf(struct html *h, enum mandoc_esc deco)
 {
 	enum htmlfont	 font;
@@ -236,7 +235,7 @@ print_metaf(struct html *h, enum mandoc_esc deco)
 		font = HTMLFONT_NONE;
 		break;
 	default:
-		abort();
+		return;
 	}
 
 	if (h->metaf) {
diff --git a/html.h b/html.h
index ed9a988c..561308bb 100644
--- a/html.h
+++ b/html.h
@@ -125,6 +125,7 @@ void		  roff_html_pre(struct html *, const struct roff_node *);
 void		  print_gen_comment(struct html *, struct roff_node *);
 void		  print_gen_decls(struct html *);
 void		  print_gen_head(struct html *);
+void		  print_metaf(struct html *, enum mandoc_esc);
 struct tag	 *print_otag(struct html *, enum htmltag, const char *, ...);
 void		  print_tagq(struct html *, const struct tag *);
 void		  print_stagq(struct html *, const struct tag *);
diff --git a/man_html.c b/man_html.c
index 6221e7ce..0f193362 100644
--- a/man_html.c
+++ b/man_html.c
@@ -26,6 +26,7 @@
 #include <string.h>
 
 #include "mandoc_aux.h"
+#include "mandoc.h"
 #include "roff.h"
 #include "man.h"
 #include "out.h"
diff --git a/mandoc.c b/mandoc.c
index aec05f73..94a58e3f 100644
--- a/mandoc.c
+++ b/mandoc.c
@@ -38,6 +38,59 @@ static	char	*time2a(time_t);
 
 
 enum mandoc_esc
+mandoc_font(const char *cp, int sz)
+{
+	switch (sz) {
+	case 0:
+		return ESCAPE_FONTPREV;
+	case 1:
+		switch (cp[0]) {
+		case 'B':
+		case '3':
+			return ESCAPE_FONTBOLD;
+		case 'I':
+		case '2':
+			return ESCAPE_FONTITALIC;
+		case 'P':
+			return ESCAPE_FONTPREV;
+		case 'R':
+		case '1':
+			return ESCAPE_FONTROMAN;
+		case '4':
+			return ESCAPE_FONTBI;
+		default:
+			return ESCAPE_ERROR;
+		}
+	case 2:
+		switch (cp[0]) {
+		case 'B':
+			switch (cp[1]) {
+			case 'I':
+				return ESCAPE_FONTBI;
+			default:
+				return ESCAPE_ERROR;
+			}
+		case 'C':
+			switch (cp[1]) {
+			case 'B':
+				return ESCAPE_FONTBOLD;
+			case 'I':
+				return ESCAPE_FONTITALIC;
+			case 'R':
+			case 'W':
+				return ESCAPE_FONTCW;
+			default:
+				return ESCAPE_ERROR;
+			}
+		default:
+			return ESCAPE_ERROR;
+		}
+	default:
+		return ESCAPE_ERROR;
+	}
+}
+
+enum mandoc_esc
 mandoc_escape(const char **end, const char **start, int *sz)
 {
 	const char	*local_start;
@@ -367,47 +420,7 @@ mandoc_escape(const char **end, const char **start, int *sz)
 
 	switch (gly) {
 	case ESCAPE_FONT:
-		if (*sz == 2) {
-			if (**start == 'C') {
-				if ((*start)[1] == 'W' ||
-				    (*start)[1] == 'R') {
-					gly = ESCAPE_FONTCW;
-					break;
-				}
-				/*
-				 * Treat other constant-width font modes
-				 * just like regular font modes.
-				 */
-				(*start)++;
-				(*sz)--;
-			} else {
-				if ((*start)[0] == 'B' && (*start)[1] == 'I')
-					gly = ESCAPE_FONTBI;
-				break;
-			}
-		} else if (*sz != 1) {
-			if (*sz == 0)
-				gly = ESCAPE_FONTPREV;
-			break;
-		}
-
-		switch (**start) {
-		case '3':
-		case 'B':
-			gly = ESCAPE_FONTBOLD;
-			break;
-		case '2':
-		case 'I':
-			gly = ESCAPE_FONTITALIC;
-			break;
-		case 'P':
-			gly = ESCAPE_FONTPREV;
-			break;
-		case '1':
-		case 'R':
-			gly = ESCAPE_FONTROMAN;
-			break;
-		}
+		gly = mandoc_font(*start, *sz);
 		break;
 	case ESCAPE_SPECIAL:
 		if (**start == 'c') {
diff --git a/mandoc.h b/mandoc.h
index 657e5c5c..a9d460eb 100644
--- a/mandoc.h
+++ b/mandoc.h
@@ -270,6 +270,7 @@ enum	mandoc_esc {
 };
 
 
+enum mandoc_esc	  mandoc_font(const char *, int sz);
 enum mandoc_esc	  mandoc_escape(const char **, const char **, int *);
 void		  mandoc_msg_setoutfile(FILE *);
 const char	 *mandoc_msg_getinfilename(void);
diff --git a/mandoc_headers.3 b/mandoc_headers.3
index 18612685..9fb1b1e1 100644
--- a/mandoc_headers.3
+++ b/mandoc_headers.3
@@ -556,7 +556,10 @@ or
 Requires
 .In sys/types.h
 for
-.Vt size_t
+.Vt size_t ,
+.Pa mandoc.h
+for
+.Vt enum mandoc_esc ,
 and
 .Qq Pa out.h
 for
diff --git a/mdoc_html.c b/mdoc_html.c
index d7678cec..4b9c7eb0 100644
--- a/mdoc_html.c
+++ b/mdoc_html.c
@@ -27,6 +27,7 @@
 #include <unistd.h>
 
 #include "mandoc_aux.h"
+#include "mandoc.h"
 #include "roff.h"
 #include "mdoc.h"
 #include "out.h"
diff --git a/regress/regress.pl b/regress/regress.pl
index 8c62a147..b9fb849b 100755
--- a/regress/regress.pl
+++ b/regress/regress.pl
@@ -79,23 +79,25 @@ sub syshtml ($@) {
 	open my $outfd, '>', $outfile or die "$outfile: $!";
 	my $infd;
 	my $pid = open3 undef, $infd, undef, @_;
-	my $state;
+	my $state = 0;
 	while (<$infd>) {
 		chomp;
 		if (!$state && s/.*<math class="eqn">//) {
-			$state = 1;
+			$state = 'math';
 			next unless length;
+		} elsif (/^BEGINTEST/) {
+			$state = 'other';
 		}
-		$state = 1 if /^BEGINTEST/;
-		if ($state && s/<\/math>.*//) {
+		if ($state eq 'math') {
 			s/^ *//;
-			print $outfd "$_\n" if length;
-			undef $state;
-			next;
+			if (s/<\/math>.*//) {
+				print $outfd "$_\n" if length;
+				$state = 0;
+				next;
+			}
 		}
-		s/^ *//;
 		print $outfd "$_\n" if $state;
-		undef $state if /^ENDTEST/;
+		$state = 0 if /^ENDTEST/;
 	}
 	close $outfd;
 	close $infd;
diff --git a/regress/roff/esc/Makefile b/regress/roff/esc/Makefile
index 74f153d5..1be8b179 100644
--- a/regress/roff/esc/Makefile
+++ b/regress/roff/esc/Makefile
@@ -1,7 +1,8 @@
-# $OpenBSD: Makefile,v 1.11 2015/04/29 18:32:57 schwarze Exp $
+# $OpenBSD: Makefile,v 1.15 2018/12/15 23:33:20 schwarze Exp $
 
 REGRESS_TARGETS	 = one two multi B c c_man e f h l O o p w z
 REGRESS_TARGETS	+= ignore invalid unsupp
+HTML_TARGETS	 = f
 LINT_TARGETS	 = B h l O w ignore invalid unsupp
 
 .include <bsd.regress.mk>
diff --git a/regress/roff/esc/f.in b/regress/roff/esc/f.in
index 7d8f9ec0..3eaca449 100644
--- a/regress/roff/esc/f.in
+++ b/regress/roff/esc/f.in
@@ -1,13 +1,12 @@
-.\" $OpenBSD: f.in,v 1.3 2017/07/04 14:53:27 schwarze Exp $
-.Dd $Mdocdate$
-.Dt ESC-F 1
-.Os
-.Sh NAME
-.Nm esc-f
-.Nd the roff escape f sequence: font changes
-.Sh DESCRIPTION
-numbers: \f3bold\f2italic\f1roman
-.br
+.\" $OpenBSD: f.in,v 1.4 2018/12/15 23:33:20 schwarze Exp $
+.TH ESC-F 1 "December 15, 2018"
+.SH NAME
+esc-f \- the roff escape f sequence: font changes
+.SH DESCRIPTION
+.nf
+BEGINTEST
+numbers: \f4bolditalic\f3bold\f2italic\f1roman
 letters: \fBbold\fIitalic\fPback\f(BIbolditalic\fRroman
-.br
-multiletter: \f[B]bold\f[I]italic\f[P]back\f[BI]bolditalic\f[R]roman
+multiletter: \f[B]bold\f[]empty\f[I]italic\f[P]back\f[BI]bolditalic\f[R]roman
+typewriter: \f(CWroman\f(CBbold\f(CRroman\f(CIitalic\fRroman
+ENDTEST
diff --git a/regress/roff/esc/f.out_ascii b/regress/roff/esc/f.out_ascii
index fb8520f8..797dbe86 100644
--- a/regress/roff/esc/f.out_ascii
+++ b/regress/roff/esc/f.out_ascii
@@ -1,11 +1,18 @@
 ESC-F(1)                    General Commands Manual                   ESC-F(1)
 
+
+
 NNAAMMEE
-     eesscc--ff - the roff escape f sequence: font changes
+       esc-f - the roff escape f sequence: font changes
 
 DDEESSCCRRIIPPTTIIOONN
-     numbers: bboolldd_i_t_a_l_i_croman
-     letters: bboolldd_i_t_a_l_i_cbbaacckk_bb_oo_ll_dd_ii_tt_aa_ll_ii_ccroman
-     multiletter: bboolldd_i_t_a_l_i_cbbaacckk_bb_oo_ll_dd_ii_tt_aa_ll_ii_ccroman
+       BEGINTEST
+       numbers: _bb_oo_ll_dd_ii_tt_aa_ll_ii_ccbboolldd_i_t_a_l_i_croman
+       letters: bboolldd_i_t_a_l_i_cbbaacckk_bb_oo_ll_dd_ii_tt_aa_ll_ii_ccroman
+       multiletter: bboollddempty_i_t_a_l_i_cback_bb_oo_ll_dd_ii_tt_aa_ll_ii_ccroman
+       typewriter: romanbboollddroman_i_t_a_l_i_croman
+       ENDTEST
+
+
 
-OpenBSD                          July 4, 2017                          OpenBSD
+OpenBSD                        December 15, 2018                      ESC-F(1)
diff --git a/regress/roff/esc/f.out_html b/regress/roff/esc/f.out_html
new file mode 100644
index 00000000..332e0f00
--- /dev/null
+++ b/regress/roff/esc/f.out_html
@@ -0,0 +1,6 @@
+BEGINTEST
+numbers: <b><i>bolditalic</i></b><b>bold</b><i>italic</i>roman
+letters: <b>bold</b><i>italic</i><b>back</b><b><i>bolditalic</i></b>roman
+multiletter: <b>bold</b>empty<i>italic</i>back<b><i>bolditalic</i></b>roman
+typewriter: <span class="Li">roman</span><b>bold</b><span class="Li">roman</span><i>italic</i>roman
+ENDTEST
diff --git a/regress/roff/ft/Makefile b/regress/roff/ft/Makefile
index 5d2accbb..0eadb05d 100644
--- a/regress/roff/ft/Makefile
+++ b/regress/roff/ft/Makefile
@@ -1,6 +1,7 @@
-# $OpenBSD: Makefile,v 1.1 2014/07/05 12:33:54 schwarze Exp $
+# $OpenBSD: Makefile,v 1.3 2018/12/15 23:33:20 schwarze Exp $
 
 REGRESS_TARGETS	= badargs badargs-mdoc
+HTML_TARGETS	= badargs
 LINT_TARGETS	= badargs badargs-mdoc
 
 SKIP_TMAN	= badargs
diff --git a/regress/roff/ft/badargs.in b/regress/roff/ft/badargs.in
index 82269609..ac3ee72a 100644
--- a/regress/roff/ft/badargs.in
+++ b/regress/roff/ft/badargs.in
@@ -1,9 +1,23 @@
-.\" $OpenBSD: badargs.in,v 1.3 2017/07/04 14:53:27 schwarze Exp $
-.TH "FT-BADARGS" 1 "July 5, 2014"
+.\" $OpenBSD: badargs.in,v 1.5 2018/12/16 00:10:03 schwarze Exp $
+.TH "FT-BADARGS" 1 "December 15, 2018"
 .SH NAME
 ft-badargs \(en font request with bad arguments
 .SH DESCRIPTION
+BEGINTEST
+.br
 default font
+.ft I
+italic
+.ft BI
+bold italic
+.ft CR
+typeqriter
+.ft CW
+roman
+.ft CB
+bold
+.ft CI
+italic
 .ft B
 bold
 .ft foo
@@ -14,3 +28,6 @@ italic
 back to bold
 .ft
 back to italic
+.ft R
+.br
+ENDTEST
diff --git a/regress/roff/ft/badargs.out_ascii b/regress/roff/ft/badargs.out_ascii
index 30bfed3c..07c2392a 100644
--- a/regress/roff/ft/badargs.out_ascii
+++ b/regress/roff/ft/badargs.out_ascii
@@ -6,8 +6,11 @@ NNAAMMEE
        ft-badargs - font request with bad arguments
 
 DDEESSCCRRIIPPTTIIOONN
-       default font bboolldd ssttiillll bboolldd _i_t_a_l_i_c bbaacckk ttoo bboolldd _b_a_c_k _t_o _i_t_a_l_i_c
+       BEGINTEST
+       default font _i_t_a_l_i_c _bb_oo_ll_dd _ii_tt_aa_ll_ii_cc typeqriter roman bboolldd _i_t_a_l_i_c bboolldd ssttiillll
+       bboolldd _i_t_a_l_i_c bbaacckk ttoo bboolldd _b_a_c_k _t_o _i_t_a_l_i_c
+       ENDTEST
 
 
 
-OpenBSD                          July 5, 2014                    FT-BADARGS(1)
+OpenBSD                        December 15, 2018                 FT-BADARGS(1)
diff --git a/regress/roff/ft/badargs.out_html b/regress/roff/ft/badargs.out_html
new file mode 100644
index 00000000..8b30ab05
--- /dev/null
+++ b/regress/roff/ft/badargs.out_html
@@ -0,0 +1,9 @@
+BEGINTEST
+<br/>
+default font <i></i><i>italic</i> <b><i></i></b><b><i>bold italic</i></b>
+  <span class="Li"></span><span class="Li">typeqriter</span>
+  <span class="Li"></span> <span class="Li">roman</span> <b></b><b>bold</b>
+  <i></i> <i>italic</i> <b></b><b>bold</b> <b>still bold</b>
+  <i></i><i>italic</i> <i></i><i>back to bold</i> <i></i><i>back to italic</i>
+<br/>
+ENDTEST</div>
diff --git a/regress/roff/ft/badargs.out_lint b/regress/roff/ft/badargs.out_lint
index 36c8c0bf..493aaeb4 100644
--- a/regress/roff/ft/badargs.out_lint
+++ b/regress/roff/ft/badargs.out_lint
@@ -1,2 +1,2 @@
-mandoc: badargs.in:11:7: ERROR: skipping excess arguments: ft ... bogus
-mandoc: badargs.in:9:2: WARNING: unknown font, skipping request: ft foo
+mandoc: badargs.in:25:7: ERROR: skipping excess arguments: ft ... bogus
+mandoc: badargs.in:23:2: WARNING: unknown font, skipping request: ft foo
diff --git a/roff.7 b/roff.7
index 66b7da90..5dfc0bb3 100644
--- a/roff.7
+++ b/roff.7
@@ -132,20 +132,73 @@ One-letter backslash escape.
 See
 .Xr mandoc_char 7
 for a complete list.
-.Ss Text Decoration
-Terms may be text-decorated using the
-.Sq \ef
-escape followed by an indicator: B (bold), I (italic), R (regular), or P
-(revert to previous mode).
-A numerical representation 3, 2, or 1 (bold, italic, and regular,
-respectively) may be used instead.
-The indicator or numerical representative may be preceded by C
-(constant-width), which is ignored.
-.Pp
-The two-character indicator
-.Sq BI
-requests a font that is both bold and italic.
-It may not be portable to old roff implementations.
+.Ss Font Selection
+In
+.Xr mdoc 7
+and
+.Xr man 7
+documents, fonts are usually selected with macros.
+The
+.Ic \ef
+escape sequence and the
+.Ic \&ft
+request can be used to manually change the font,
+but this is not recommended in
+.Xr mdoc 7
+documents.
+Such manual font changes are overridden by many subsequent macros.
+.Pp
+The following fonts are supported:
+.Pp
+.Bl -tag -width CW -offset indent -compact
+.It Cm B
+Bold font.
+.It Cm BI
+A font that is both bold and italic.
+.It Cm CB
+Bold constant width font.
+Same as
+.Cm B
+in terminal output.
+.It Cm CI
+Italic constant width font.
+Same as
+.Cm I
+in terminal output.
+.It Cm CR
+Regular constant width font.
+Same as
+.Cm R
+in terminal output.
+.It Cm CW
+An alias for
+.Cm CR .
+.It Cm I
+Italic font.
+.It Cm P
+Return to the previous font.
+If a macro caused a font change since the last
+.Ic \ef
+eascape sequence or
+.Ic \&ft
+request, this returns to the font before the last font change in
+the macro rather than to the font before the last manual font change.
+.It Cm R
+Roman font.
+This is the default font.
+.It Cm 1
+An alias for
+.Cm R .
+.It Cm 2
+An alias for
+.Cm I .
+.It Cm 3
+An alias for
+.Cm B .
+.It Cm 4
+An alias for
+.Cm BI .
+.El
 .Pp
 Examples:
 .Bl -tag -width Ds -offset indent -compact
@@ -156,12 +209,6 @@ Write in \fIitalic\fP, then return to previous font mode.
 .It Li \ef(BIbold italic\efP
 Write in \f(BIbold italic\fP, then return to previous font mode.
 .El
-.Pp
-Text decoration is
-.Em not
-recommended for
-.Xr mdoc 7 ,
-which encourages semantic annotation.
 .Ss Whitespace
 Whitespace consists of the space character.
 In text lines, whitespace is preserved within a line.
@@ -890,27 +937,12 @@ This is a Heirloom extension and currently ignored.
 Conditionally define a special font.
 This is a groff extension and currently ignored.
 .It Ic \&ft Op Ar font
-Change the font.
-The following
+Change the font; see
+.Sx Font Selection .
+The
 .Ar font
-arguments are supported:
-.Bl -tag -width 4n -offset indent
-.It Cm B , BI , CB , 3 , 4
-switches to
-.Sy bold
-font
-.It Cm I , CI , 2
-switches to
-.Em underlined
-font
-.It Cm R , CR , CW , 1
-switches to normal font
-.It Cm P No "or no argument"
-switches back to the previous font
-.El
-.Pp
-This request takes effect only locally and may be overridden
-by macros and escape sequences.
+argument defaults to
+.Cm P .
 .It Ic \&ftr Ar newname Op Ar oldname
 Translate font name.
 This is a groff extension and currently ignored.
@@ -2006,11 +2038,15 @@ and
 Switch to the font
 .Ar name ,
 see
-.Sx Text Decoration .
+.Sx Font Selection .
 For short names, there are variants
 .Ic \ef Ns Ar c
 and
 .Ic \ef( Ns Ar cc .
+An empty name
+.Ic \ef[]
+defaults to
+.Ic \efP .
 .It Ic \eg[ Ns Ar name Ns Ic \&]
 Interpolate the format of a number register; ignored by
 .Xr mandoc 1 .
diff --git a/roff_html.c b/roff_html.c
index ea123561..fc0f2e30 100644
--- a/roff_html.c
+++ b/roff_html.c
@@ -18,8 +18,10 @@
 #include <sys/types.h>
 
 #include <assert.h>
-#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
 
+#include "mandoc.h"
 #include "roff.h"
 #include "out.h"
 #include "html.h"
@@ -30,12 +32,13 @@ typedef	void	(*roff_html_pre_fp)(ROFF_HTML_ARGS);
 
 static	void	  roff_html_pre_br(ROFF_HTML_ARGS);
 static	void	  roff_html_pre_ce(ROFF_HTML_ARGS);
+static	void	  roff_html_pre_ft(ROFF_HTML_ARGS);
 static	void	  roff_html_pre_sp(ROFF_HTML_ARGS);
 
 static	const roff_html_pre_fp roff_html_pre_acts[ROFF_MAX] = {
 	roff_html_pre_br,  /* br */
 	roff_html_pre_ce,  /* ce */
-	NULL,  /* ft */
+	roff_html_pre_ft,  /* ft */
 	NULL,  /* ll */
 	NULL,  /* mc */
 	NULL,  /* po */
@@ -75,6 +78,15 @@ roff_html_pre_ce(ROFF_HTML_ARGS)
 }
 
 static void
+roff_html_pre_ft(ROFF_HTML_ARGS)
+{
+	const char	*cp;
+
+	cp = n->child->string;
+	print_metaf(h, mandoc_font(cp, (int)strlen(cp)));
+}
+
+static void
 roff_html_pre_sp(ROFF_HTML_ARGS)
 {
 	print_paragraph(h);
diff --git a/roff_term.c b/roff_term.c
index eb566abe..d0acc4f0 100644
--- a/roff_term.c
+++ b/roff_term.c
@@ -18,6 +18,7 @@
 
 #include <assert.h>
 #include <stdio.h>
+#include <string.h>
 
 #include "mandoc.h"
 #include "roff.h"
@@ -113,25 +114,22 @@ roff_term_pre_ft(ROFF_TERM_ARGS)
 {
 	const char	*cp;
 
-	if (*(cp = n->child->string) == 'C')
-		cp++;
-
-	switch (*cp) {
-	case '4':
-	case '3':
-	case 'B':
+	cp = n->child->string;
+	switch (mandoc_font(cp, (int)strlen(cp))) {
+	case ESCAPE_FONTBOLD:
 		term_fontrepl(p, TERMFONT_BOLD);
 		break;
-	case '2':
-	case 'I':
+	case ESCAPE_FONTITALIC:
 		term_fontrepl(p, TERMFONT_UNDER);
 		break;
-	case 'P':
+	case ESCAPE_FONTBI:
+		term_fontrepl(p, TERMFONT_BI);
+		break;
+	case ESCAPE_FONTPREV:
 		term_fontlast(p);
 		break;
-	case '1':
-	case 'C':
-	case 'R':
+	case ESCAPE_FONTROMAN:
+	case ESCAPE_FONTCW:
 		term_fontrepl(p, TERMFONT_NONE);
 		break;
 	default:
diff --git a/roff_validate.c b/roff_validate.c
index ee14188b..0aaace13 100644
--- a/roff_validate.c
+++ b/roff_validate.c
@@ -104,30 +104,8 @@ roff_valid_ft(ROFF_VALID_ARGS)
 	}
 
 	cp = n->child->string;
-	switch (*cp) {
-	case '1':
-	case '2':
-	case '3':
-	case '4':
-	case 'I':
-	case 'P':
-	case 'R':
-		if (cp[1] == '\0')
-			return;
-		break;
-	case 'B':
-		if (cp[1] == '\0' || (cp[1] == 'I' && cp[2] == '\0'))
-			return;
-		break;
-	case 'C':
-		if (cp[1] != '\0' && cp[2] == '\0' &&
-		    strchr("BIRW", cp[1]) != NULL)
-			return;
-		break;
-	default:
-		break;
-	}
-
+	if (mandoc_font(cp, (int)strlen(cp)) != ESCAPE_ERROR)
+		return;
 	mandoc_msg(MANDOCERR_FT_BAD, n->line, n->pos, "ft %s", cp);
 	roff_node_delete(man, n);
 }
diff --git a/tbl_html.c b/tbl_html.c
index dd0778f0..52e20886 100644
--- a/tbl_html.c
+++ b/tbl_html.c
@@ -24,6 +24,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "mandoc.h"
 #include "tbl.h"
 #include "out.h"
 #include "html.h"