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.

5 files changed, 7 insertions, 6 deletions

diff --git a/html.c b/html.c
index 0199edb0..7b92f006 100644
--- a/html.c
+++ b/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[TAG_MAX] = {
 	{"style",	HTML_NLALL | HTML_INDENT},
 	{"title",	HTML_NLAROUND},
 	{"body",	HTML_NLALL},
+	{"main",	HTML_NLALL},
 	{"div",		HTML_NLAROUND},
 	{"section",	HTML_NLALL},
 	{"nav",		HTML_NLALL},
diff --git a/html.h b/html.h
index 32742461..38391c26 100644
--- a/html.h
+++ b/html.h
@@ -27,6 +27,7 @@ enum	htmltag {
 	TAG_STYLE,
 	TAG_TITLE,
 	TAG_BODY,
+	TAG_MAIN,
 	TAG_DIV,
 	TAG_SECTION,
 	TAG_NAV,
diff --git a/man_html.c b/man_html.c
index 5f715cf0..cd442a35 100644
--- a/man_html.c
+++ b/man_html.c
@@ -132,7 +132,7 @@ html_man(void *arg, const struct roff_meta *man)
 	}
 
 	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);
diff --git a/mandoc.css b/mandoc.css
index 73f5c668..d2d55cec 100644
--- a/mandoc.css
+++ b/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::before, .Sx::before, .Sy::before,
 /* 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 {
diff --git a/mdoc_html.c b/mdoc_html.c
index a0e29c72..16b72e00 100644
--- a/mdoc_html.c
+++ b/mdoc_html.c
@@ -302,7 +302,7 @@ html_mdoc(void *arg, const struct roff_meta *mdoc)
 	}
 
 	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);