mandoc: Finally get rid of the archaic <table> markup for header and

mandoc: Finally get rid of the archaic <table> markup for header and

[schwarze]

Log Message:
-----------
Finally get rid of the archaic <table> markup for header and footer lines 
and use flexbox CSS instead.  Improve accessibility by adding role 
and aria-label attributes to these header and footer lines.
Using ideas from both Anna Vyalkova <cyber at sysrq dot in> and myself.

As a welcome side effect, this also resolves the long-standing issue
that the rendering was always 65em wide, requiring horizontal scrolling
when the window was narrower.  Now, rendering nicely adapts to browser
windows of arbitrary narrowness.

Modified Files:
--------------
    mandoc:
        TODO
        man_html.c
        mandoc.css
        mdoc_html.c

Revision Data
-------------
Index: mdoc_html.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mdoc_html.c,v
retrieving revision 1.346
retrieving revision 1.347
diff -Lmdoc_html.c -Lmdoc_html.c -u -p -r1.346 -r1.347
--- mdoc_html.c
+++ mdoc_html.c
@@ -453,16 +453,19 @@ print_mdoc_node(MDOC_ARGS)
 static void
 mdoc_root_post(const struct roff_meta *meta, struct html *h)
 {
-	struct tag	*t, *tt;
+	struct tag	*t;
 
-	t = print_otag(h, TAG_TABLE, "c", "foot");
-	tt = print_otag(h, TAG_TR, "");
+	t = print_otag(h, TAG_DIV, "cr?", "foot", "doc-pagefooter",
+	    "aria-label", "manual footer line");
 
-	print_otag(h, TAG_TD, "c", "foot-date");
+	print_otag(h, TAG_SPAN, "c", "foot-left");
+	print_stagq(h, t);
+
+	print_otag(h, TAG_SPAN, "c", "foot-date");
 	print_text(h, meta->date);
-	print_stagq(h, tt);
+	print_stagq(h, t);
 
-	print_otag(h, TAG_TD, "c", "foot-os");
+	print_otag(h, TAG_SPAN, "c", "foot-os");
 	print_text(h, meta->os);
 	print_tagq(h, t);
 }
@@ -470,7 +473,7 @@ mdoc_root_post(const struct roff_meta *m
 static int
 mdoc_root_pre(const struct roff_meta *meta, struct html *h)
 {
-	struct tag	*t, *tt;
+	struct tag	*t;
 	char		*volume, *title;
 
 	if (NULL == meta->arch)
@@ -485,18 +488,18 @@ mdoc_root_pre(const struct roff_meta *me
 		mandoc_asprintf(&title, "%s(%s)",
 		    meta->title, meta->msec);
 
-	t = print_otag(h, TAG_TABLE, "c", "head");
-	tt = print_otag(h, TAG_TR, "");
+	t = print_otag(h, TAG_DIV, "cr?", "head", "doc-pageheader",
+	    "aria-label", "manual header line");
 
-	print_otag(h, TAG_TD, "c", "head-ltitle");
+	print_otag(h, TAG_SPAN, "c", "head-ltitle");
 	print_text(h, title);
-	print_stagq(h, tt);
+	print_stagq(h, t);
 
-	print_otag(h, TAG_TD, "c", "head-vol");
+	print_otag(h, TAG_SPAN, "c", "head-vol");
 	print_text(h, volume);
-	print_stagq(h, tt);
+	print_stagq(h, t);
 
-	print_otag(h, TAG_TD, "c", "head-rtitle");
+	print_otag(h, TAG_SPAN, "c", "head-rtitle");
 	print_text(h, title);
 	print_tagq(h, t);
 
Index: man_html.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/man_html.c,v
retrieving revision 1.181
retrieving revision 1.182
diff -Lman_html.c -Lman_html.c -u -p -r1.181 -r1.182
--- man_html.c
+++ man_html.c
@@ -1,6 +1,6 @@
 /* $Id$ */
 /*
- * Copyright (c) 2013-2015, 2017-2020 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2013-2015,2017-2020,2022 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2008-2012, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -263,26 +263,26 @@ print_man_node(MAN_ARGS)
 static void
 man_root_pre(const struct roff_meta *man, struct html *h)
 {
-	struct tag	*t, *tt;
+	struct tag	*t;
 	char		*title;
 
 	assert(man->title);
 	assert(man->msec);
 	mandoc_asprintf(&title, "%s(%s)", man->title, man->msec);
 
-	t = print_otag(h, TAG_TABLE, "c", "head");
-	tt = print_otag(h, TAG_TR, "");
+	t = print_otag(h, TAG_DIV, "cr?", "head", "doc-pageheader",
+	    "aria-label", "manual header line");
 
-	print_otag(h, TAG_TD, "c", "head-ltitle");
+	print_otag(h, TAG_SPAN, "c", "head-ltitle");
 	print_text(h, title);
-	print_stagq(h, tt);
+	print_stagq(h, t);
 
-	print_otag(h, TAG_TD, "c", "head-vol");
+	print_otag(h, TAG_SPAN, "c", "head-vol");
 	if (man->vol != NULL)
 		print_text(h, man->vol);
-	print_stagq(h, tt);
+	print_stagq(h, t);
 
-	print_otag(h, TAG_TD, "c", "head-rtitle");
+	print_otag(h, TAG_SPAN, "c", "head-rtitle");
 	print_text(h, title);
 	print_tagq(h, t);
 	free(title);
@@ -291,16 +291,19 @@ man_root_pre(const struct roff_meta *man
 static void
 man_root_post(const struct roff_meta *man, struct html *h)
 {
-	struct tag	*t, *tt;
+	struct tag	*t;
+
+	t = print_otag(h, TAG_DIV, "cr?", "foot", "doc-pagefooter",
+	    "aria-label", "manual footer line");
 
-	t = print_otag(h, TAG_TABLE, "c", "foot");
-	tt = print_otag(h, TAG_TR, "");
+	print_otag(h, TAG_SPAN, "c", "foot-left");
+	print_stagq(h, t);
 
-	print_otag(h, TAG_TD, "c", "foot-date");
+	print_otag(h, TAG_SPAN, "c", "foot-date");
 	print_text(h, man->date);
-	print_stagq(h, tt);
+	print_stagq(h, t);
 
-	print_otag(h, TAG_TD, "c", "foot-os");
+	print_otag(h, TAG_SPAN, "c", "foot-os");
 	if (man->os != NULL)
 		print_text(h, man->os);
 	print_tagq(h, t);
Index: TODO
===================================================================
RCS file: /home/cvs/mandoc/mandoc/TODO,v
retrieving revision 1.325
retrieving revision 1.326
diff -LTODO -LTODO -u -p -r1.325 -r1.326
--- TODO
+++ TODO
@@ -538,13 +538,6 @@ are mere guesses, and some may be wrong.
   does this affect other characters, other source macros...?
   Jackson Pauls  29 Aug 2017 16:56:27 +0100
 
-- The tables used to render the three-part page headers actually force
-  the width of the <body> to the max-width given for <html>.
-  Not yet sure how to fix that...
-  Observed by an Anonymous Coward on undeadly.org:
-  http://undeadly.org/cgi?action=article&sid=20140925064244&pid=1
-  loc *  exist *  algo **  size *  imp ***
-
 - generate <img> tags in HTML
   idea from florian@  Tue, 7 Apr 2015 00:26:28 +0000
   may be possible to implement with .Lk img://something.png alt_text
Index: mandoc.css
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mandoc.css,v
retrieving revision 1.50
retrieving revision 1.51
diff -Lmandoc.css -Lmandoc.css -u -p -r1.50 -r1.51
--- mandoc.css
+++ mandoc.css
@@ -53,19 +53,28 @@ table.results {	margin-top: 1em;
 
 /* Header and footer lines. */
 
-table.head {	width: 100%;
+div[role=doc-pageheader] {
+		display: flex;
 		border-bottom: 1px dotted #808080;
 		margin-bottom: 1em;
 		font-size: smaller; }
-td.head-vol {	text-align: center; }
-td.head-rtitle {
+.head-ltitle {	flex: 1; }
+.head-vol {	flex: 0 1 auto;
+		text-align: center; }
+.head-rtitle {	flex: 1;
 		text-align: right; }
 
-table.foot {	width: 100%;
+div[role=doc-pagefooter] {
+		display: flex;
+		justify-content: space-between;
 		border-top: 1px dotted #808080;
 		margin-top: 1em;
 		font-size: smaller; }
-td.foot-os {	text-align: right; }
+.foot-left {	flex: 1; }
+.foot-date {	flex: 0 1 auto;
+		text-align: center; }
+.foot-os {	flex: 1;
+		text-align: right; }
 
 /* Sections and paragraphs. */
 
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