Is there any reason not to use <EM> for items emphasized with .Em?

[Guy Harris <guy@alum.mit.edu>]

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.Em is documented in the groff_mdoc man page as

   Emphasis Macro
     Text may be stressed or emphasized with the `.Em' macro.  The usual font
     for emphasis is italic.

That sounds like the <EM> HTML tag - the HTML 4.01 spec says

	EM:
	Indicates emphasis.

		...

	The presentation of phrase elements depends on the user agent. Generally, visual user agents present EM text in italics and STRONG text in bold font. Speech synthesizer user agents may change the synthesis parameters, such as volume, pitch and rate accordingly.

Is there any reason not to use that tag for text emphasized with .Em?

If not, see the attached patch.

(BTW, is there anonymous CVS access to the source repository?  I got the top-of-trunk source with a pile of curl calls from the cvsweb site, but that's kind of a pain.)


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--- example.style.css.dist	2012-12-18 19:40:25.000000000 -0800
+++ example.style.css	2012-12-20 16:25:33.000000000 -0800
@@ -30,7 +30,7 @@
 div.mandoc i			{ } /* Italic: BI, IB, I, (implicit). */
 div.mandoc b			{ } /* Bold: SB, BI, IB, BR, RB, B, (implicit). */
 div.mandoc small		{ } /* Small: SB, SM. */
-div.mandoc .emph		{ font-style: italic; font-weight: normal; } /* Emphasis: Em, Bl -emphasis. */
+div.mandoc em			{ font-style: italic; font-weight: normal; } /* Emphasis: Em, Bl -emphasis. */
 div.mandoc .symb		{ font-style: normal; font-weight: bold; } /* Symbolic: Sy, Ms, Bf -symbolic. */
 div.mandoc .lit			{ font-style: normal; font-weight: normal; font-family: monospace; } /* Literal: Dl, Li, Ql, Bf -literal, Bl -literal, Bl -unfilled. */
 div.mandoc i.addr		{ font-weight: normal; } /* Address (Ad). */
--- html.c.dist	2012-12-18 19:40:27.000000000 -0800
+++ html.c	2012-12-20 14:40:51.000000000 -0800
@@ -75,6 +75,7 @@
 	{"i",		0 }, /* TAG_I */
 	{"code",	0 }, /* TAG_CODE */
 	{"small",	0 }, /* TAG_SMALL */
+	{"em",		0 }, /* TAG_EM */
 };
 
 static	const char	*const htmlattrs[ATTR_MAX] = {
--- html.h.dist	2012-12-18 19:40:27.000000000 -0800
+++ html.h	2012-12-20 14:41:05.000000000 -0800
@@ -50,6 +50,7 @@
 	TAG_I,
 	TAG_CODE,
 	TAG_SMALL,
+	TAG_EM,
 	TAG_MAX
 };
 
--- mdoc_html.c.dist	2012-12-18 19:40:51.000000000 -0800
+++ mdoc_html.c	2012-12-20 16:26:52.000000000 -0800
@@ -1112,10 +1112,7 @@
 static int
 mdoc_em_pre(MDOC_ARGS)
 {
-	struct htmlpair	tag;
-
-	PAIR_CLASS_INIT(&tag, "emph");
-	print_otag(h, TAG_SPAN, 1, &tag);
+	print_otag(h, TAG_EM, 0, NULL);
 	return(1);
 }
 
@@ -1892,9 +1889,7 @@
 	else if (MDOC_BODY != n->type)
 		return(1);
 
-	if (FONT_Em == n->norm->Bf.font) 
-		PAIR_CLASS_INIT(&tag[0], "emph");
-	else if (FONT_Sy == n->norm->Bf.font) 
+	if (FONT_Sy == n->norm->Bf.font) 
 		PAIR_CLASS_INIT(&tag[0], "symb");
 	else if (FONT_Li == n->norm->Bf.font) 
 		PAIR_CLASS_INIT(&tag[0], "lit");
@@ -1912,6 +1907,10 @@
 	bufcat_su(h, "margin-left", &su);
 	PAIR_STYLE_INIT(&tag[1], h);
 	print_otag(h, TAG_DIV, 2, tag);
+	if (FONT_Em == n->norm->Bf.font) {
+		/* Tag this with <EM>. */
+		print_otag(h, TAG_EM, 0, NULL);
+	}
 	return(1);
 }
 
--- style.css.dist	2012-12-18 19:41:01.000000000 -0800
+++ style.css	2012-12-20 16:24:17.000000000 -0800
@@ -34,7 +34,7 @@
 /* General font modes. */
 
 i		{ } /* Italic: BI, IB, I, (implicit). */
-.emph		{ font-style: italic; font-weight: normal; } /* Emphasis: Em, Bl -emphasis. */
+em		{ font-style: italic; font-weight: normal; } /* Emphasis: Em, Bl -emphasis. */
 b		{ } /* Bold: SB, BI, IB, BR, RB, B, (implicit). */
 .symb		{ font-style: normal; font-weight: bold; } /* Symbolic: Sy, Ms, Bf -symbolic. */
 small		{ } /* Small: SB, SM. */