===================================================================
RCS file: /cvs/mandoc/html.c,v
retrieving revision 1.217
retrieving revision 1.218
diff -u -p -r1.217 -r1.218
--- mandoc/html.c	2017/07/14 16:06:44	1.217
+++ mandoc/html.c	2017/07/14 16:28:38	1.218
@@ -1,4 +1,4 @@
-/*	$Id: html.c,v 1.217 2017/07/14 16:06:44 schwarze Exp $ */
+/*	$Id: html.c,v 1.218 2017/07/14 16:28:38 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011-2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -624,8 +624,13 @@ print_otag(struct html *h, enum htmltag tag, const cha
 			su = va_arg(ap, struct roffsu *);
 			break;
 		case 'w':
-			if ((arg2 = va_arg(ap, char *)) == NULL)
+			if ((arg2 = va_arg(ap, char *)) == NULL) {
+				if (*fmt == '+')
+					fmt++;
+				if (*fmt == '-')
+					fmt++;
 				break;
+			}
 			su = &mysu;
 			a2width(arg2, su);
 			if (*fmt == '+') {