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The groff man-ext macros define fonts CB, CI, and CR,
and some groff manual pages actually use them in .ft requests.
It's easy enough to handle these .ft requests in mandoc, too.

/*	$Id: roff_validate.c,v 1.10 2018/08/10 20:40:45 schwarze Exp $ */
/*
 * Copyright (c) 2010, 2017, 2018 Ingo Schwarze <schwarze@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <sys/types.h>

#include <assert.h>
#include <stddef.h>
#include <string.h>

#include "mandoc.h"
#include "roff.h"
#include "libmandoc.h"
#include "roff_int.h"

#define	ROFF_VALID_ARGS struct roff_man *man, struct roff_node *n

typedef	void	(*roff_valid_fp)(ROFF_VALID_ARGS);

static	void	  roff_valid_ft(ROFF_VALID_ARGS);

static	const roff_valid_fp roff_valids[ROFF_MAX] = {
	NULL,  /* br */
	NULL,  /* ce */
	roff_valid_ft,  /* ft */
	NULL,  /* ll */
	NULL,  /* mc */
	NULL,  /* po */
	NULL,  /* rj */
	NULL,  /* sp */
	NULL,  /* ta */
	NULL,  /* ti */
};


void
roff_validate(struct roff_man *man)
{
	struct roff_node	*n;

	n = man->last;
	assert(n->tok < ROFF_MAX);
	if (roff_valids[n->tok] != NULL)
		(*roff_valids[n->tok])(man, n);
}

static void
roff_valid_ft(ROFF_VALID_ARGS)
{
	const char		*cp;

	if (n->child == NULL) {
		man->next = ROFF_NEXT_CHILD;
		roff_word_alloc(man, n->line, n->pos, "P");
		man->last = n;
		return;
	}

	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;
	}

	mandoc_vmsg(MANDOCERR_FT_BAD, man->parse,
	    n->line, n->pos, "ft %s", cp);
	roff_node_delete(man, n);
}