mandoc: Instead of the custom <div class="manual-text">, use the

mandoc: Instead of the custom <div class="manual-text">, use the

[schwarze]

Log Message:
-----------
Instead of the custom <div class="manual-text">, use the standard 
HTML <main> element.  The benefit is that it has the ARIA landmark 
role "main" by default.  To ease the transition for people using 
their own CSS file instead of mandoc.css, retain the custom class
for now.

I had this idea in a discussion with Anna Vyalkova <cyber at sysrq dot in>.
Patch from Anna, slightly tweaked by me.

Modified Files:
--------------
    mandoc:
        html.c
        html.h
        man_html.c
        mandoc.css
        mdoc_html.c

Revision Data
-------------
Index: mandoc.css
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mandoc.css,v
retrieving revision 1.49
retrieving revision 1.50
diff -Lmandoc.css -Lmandoc.css -u -p -r1.49 -r1.50
--- mandoc.css
+++ mandoc.css
@@ -69,8 +69,7 @@ td.foot-os {	text-align: right; }
 
 /* Sections and paragraphs. */
 
-.manual-text {
-		margin-left: 3.8em; }
+main {		margin-left: 3.8em; }
 .Nd { }
 section.Sh { }
 h1.Sh {		margin-top: 1.2em;
@@ -338,8 +337,7 @@ h1.Sh::before, h2.Ss::before, .St::befor
 /* Overrides to avoid excessive margins on small devices. */
 
 @media (max-width: 37.5em) {
-.manual-text {
-		margin-left: 0.5em; }
+main {		margin-left: 0.5em; }
 h1.Sh, h2.Ss {	margin-left: 0em; }
 .Bd-indent {	margin-left: 2em; }
 .Bl-hang > dd {
Index: html.h
===================================================================
RCS file: /home/cvs/mandoc/mandoc/html.h,v
retrieving revision 1.110
retrieving revision 1.111
diff -Lhtml.h -Lhtml.h -u -p -r1.110 -r1.111
--- html.h
+++ html.h
@@ -27,6 +27,7 @@ enum	htmltag {
 	TAG_STYLE,
 	TAG_TITLE,
 	TAG_BODY,
+	TAG_MAIN,
 	TAG_DIV,
 	TAG_SECTION,
 	TAG_NAV,
Index: mdoc_html.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mdoc_html.c,v
retrieving revision 1.344
retrieving revision 1.345
diff -Lmdoc_html.c -Lmdoc_html.c -u -p -r1.344 -r1.345
--- mdoc_html.c
+++ mdoc_html.c
@@ -302,7 +302,7 @@ html_mdoc(void *arg, const struct roff_m
 	}
 
 	mdoc_root_pre(mdoc, h);
-	t = print_otag(h, TAG_DIV, "c", "manual-text");
+	t = print_otag(h, TAG_MAIN, "c", "manual-text");
 	print_mdoc_nodelist(mdoc, n, h);
 	print_tagq(h, t);
 	mdoc_root_post(mdoc, h);
Index: man_html.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/man_html.c,v
retrieving revision 1.179
retrieving revision 1.180
diff -Lman_html.c -Lman_html.c -u -p -r1.179 -r1.180
--- man_html.c
+++ man_html.c
@@ -132,7 +132,7 @@ html_man(void *arg, const struct roff_me
 	}
 
 	man_root_pre(man, h);
-	t = print_otag(h, TAG_DIV, "c", "manual-text");
+	t = print_otag(h, TAG_MAIN, "c", "manual-text");
 	print_man_nodelist(man, n, h);
 	print_tagq(h, t);
 	man_root_post(man, h);
Index: html.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/html.c,v
retrieving revision 1.276
retrieving revision 1.277
diff -Lhtml.c -Lhtml.c -u -p -r1.276 -r1.277
--- html.c
+++ html.c
@@ -2,6 +2,7 @@
 /*
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011-2015, 2017-2021 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2022 Anna Vyalkova <cyber@sysrq.in>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -67,6 +68,7 @@ static	const struct htmldata htmltags[TA
 	{"style",	HTML_NLALL | HTML_INDENT},
 	{"title",	HTML_NLAROUND},
 	{"body",	HTML_NLALL},
+	{"main",	HTML_NLALL},
 	{"div",		HTML_NLAROUND},
 	{"section",	HTML_NLALL},
 	{"nav",		HTML_NLALL},
--
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