diff --git a/render/box_construct.c b/render/box_construct.c
index fbaa9db5e..e103d44cc 100644
--- a/render/box_construct.c
+++ b/render/box_construct.c
@@ -40,6 +40,7 @@
 #include "render/box.h"
 #include "render/form.h"
 #include "render/html_internal.h"
+#include "utils/corestrings.h"
 #include "utils/locale.h"
 #include "utils/log.h"
 #include "utils/messages.h"
@@ -1647,13 +1648,17 @@ bool box_a(BOX_SPECIAL_PARAMS)
 	/* target frame [16.3] */
 	err = dom_element_get_attribute(n, kstr_target, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
-		if (!strcasecmp(dom_string_data(s), "_blank"))
+		if (dom_string_caseless_lwc_isequal(s,
+				corestring_lwc__blank))
 			box->target = TARGET_BLANK;
-		else if (!strcasecmp(dom_string_data(s), "_top"))
+		else if (dom_string_caseless_lwc_isequal(s,
+				corestring_lwc__top))
 			box->target = TARGET_TOP;
-		else if (!strcasecmp(dom_string_data(s), "_parent"))
+		else if (dom_string_caseless_lwc_isequal(s,
+				corestring_lwc__parent))
 			box->target = TARGET_PARENT;
-		else if (!strcasecmp(dom_string_data(s), "_self"))
+		else if (dom_string_caseless_lwc_isequal(s,
+				corestring_lwc__self))
 			/* the default may have been overridden by a
 			 * <base target=...>, so this is different to 0 */
 			box->target = TARGET_SELF;
@@ -1941,7 +1946,8 @@ bool box_object(BOX_SPECIAL_PARAMS)
 				return false;
 			}
 
-			if (strcasecmp(dom_string_data(name), "param") != 0) {
+			if (!dom_string_caseless_lwc_isequal(name,
+					corestring_lwc_param)) {
 				/* The first non-param child is the start of 
 				 * the alt html. Therefore, we should break 
 				 * out of this loop. */
@@ -2122,7 +2128,8 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 	/* common extension: frameborder="yes|no" to control all children */
 	err = dom_element_get_attribute(n, kstr_frameborder, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
-	  	if (strcasecmp(dom_string_data(s), "no") == 0)
+	  	if (dom_string_caseless_lwc_isequal(s,
+	  			corestring_lwc_no) == 0)
 	  		default_border = false;
 		dom_string_unref(s);
 	}
@@ -2194,12 +2201,13 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 				}
 
 				if (type != DOM_ELEMENT_NODE ||
-						(strcasecmp(
-							dom_string_data(name),
-							"frame") != 0 &&
-						strcasecmp(
-							dom_string_data(name),
-							"frameset") != 0)) {
+					(!dom_string_caseless_lwc_isequal(
+							name,
+							corestring_lwc_frame) &&
+					!dom_string_caseless_lwc_isequal(
+							name,
+							corestring_lwc_frameset
+							))) {
 					err = dom_node_get_next_sibling(c, 
 							&next);
 					if (err != DOM_NO_ERR) {
@@ -2229,7 +2237,8 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 				return false;
 			}
 
-			if (strcasecmp(dom_string_data(s), "frameset") == 0) {
+			if (dom_string_caseless_lwc_isequal(s,
+					corestring_lwc_frameset)) {
 				dom_string_unref(s);
 				frame->border = 0;
 				if (box_create_frameset(frame, c, 
@@ -2290,10 +2299,11 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 
 			err = dom_element_get_attribute(c, kstr_scrolling, &s);
 			if (err == DOM_NO_ERR && s != NULL) {
-				if (strcasecmp(dom_string_data(s), "yes") == 0)
+				if (dom_string_caseless_lwc_isequal(s,
+						corestring_lwc_yes))
 					frame->scrolling = SCROLLING_YES;
-				else if (strcasecmp(dom_string_data(s), 
-						"no") == 0)
+				else if (dom_string_caseless_lwc_isequal(s,
+						corestring_lwc_no))
 					frame->scrolling = SCROLLING_NO;
 				dom_string_unref(s);
 			}
@@ -2447,9 +2457,11 @@ bool box_iframe(BOX_SPECIAL_PARAMS)
 
 	err = dom_element_get_attribute(n, kstr_scrolling, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
-		if (strcasecmp(dom_string_data(s), "yes") == 0)
+		if (dom_string_caseless_lwc_isequal(s,
+				corestring_lwc_yes))
 			iframe->scrolling = SCROLLING_YES;
-		else if (strcasecmp(dom_string_data(s), "no") == 0)
+		else if (dom_string_caseless_lwc_isequal(s,
+				corestring_lwc_no))
 			iframe->scrolling = SCROLLING_NO;
 		dom_string_unref(s);
 	}
@@ -2497,21 +2509,33 @@ bool box_input(BOX_SPECIAL_PARAMS)
 	box->gadget = gadget;
 	gadget->box = box;
 
-	if (type && strcasecmp(dom_string_data(type), "password") == 0) {
+	if (type && dom_string_caseless_lwc_isequal(type,
+			corestring_lwc_password)) {
 		if (box_input_text(n, content, box, 0, true) == false)
 			goto no_memory;
-	} else if (type && strcasecmp(dom_string_data(type), "file") == 0) {
+
+	} else if (type && dom_string_caseless_lwc_isequal(type,
+			corestring_lwc_file)) {
 		box->type = BOX_INLINE_BLOCK;
-	} else if (type && strcasecmp(dom_string_data(type), "hidden") == 0) {
+
+	} else if (type && dom_string_caseless_lwc_isequal(type,
+			corestring_lwc_hidden)) {
 		/* no box for hidden inputs */
 		box->type = BOX_NONE;
+
 	} else if (type && 
-			(strcasecmp(dom_string_data(type), "checkbox") == 0 ||
-			strcasecmp(dom_string_data(type), "radio") == 0)) {
+			(dom_string_caseless_lwc_isequal(type,
+				corestring_lwc_checkbox) ||
+			dom_string_caseless_lwc_isequal(type,
+				corestring_lwc_radio))) {
+
 	} else if (type && 
-			(strcasecmp(dom_string_data(type), "submit") == 0 ||
-			strcasecmp(dom_string_data(type), "reset") == 0 ||
-			strcasecmp(dom_string_data(type), "button") == 0)) {
+			(dom_string_caseless_lwc_isequal(type,
+				corestring_lwc_submit) ||
+			dom_string_caseless_lwc_isequal(type,
+				corestring_lwc_reset) ||
+			dom_string_caseless_lwc_isequal(type,
+				corestring_lwc_button))) {
 		struct box *inline_container, *inline_box;
 
 		if (box_button(n, content, box, 0) == false)
@@ -2551,7 +2575,9 @@ bool box_input(BOX_SPECIAL_PARAMS)
 		box_add_child(inline_container, inline_box);
 
 		box_add_child(box, inline_container);
-	} else if (type && strcasecmp(dom_string_data(type), "image") == 0) {
+
+	} else if (type && dom_string_caseless_lwc_isequal(type,
+			corestring_lwc_image)) {
 		gadget->type = GADGET_IMAGE;
 
 		if (box->style && css_computed_display(box->style,
@@ -2703,14 +2729,16 @@ bool box_select(BOX_SPECIAL_PARAMS)
 			return false;
 		}
 
-		if (strcasecmp(dom_string_data(name), "option") == 0) {
+		if (dom_string_caseless_lwc_isequal(name,
+				corestring_lwc_option)) {
 			dom_string_unref(name);
 
 			if (box_select_add_option(gadget, c) == false) {
 				dom_node_unref(c);
 				goto no_memory;
 			}
-		} else if (strcasecmp(dom_string_data(name), "optgroup") == 0) {
+		} else if (dom_string_caseless_lwc_isequal(name,
+				corestring_lwc_optgroup)) {
 			dom_string_unref(name);
 
 			err = dom_node_get_first_child(c, &c2);
@@ -2729,8 +2757,8 @@ bool box_select(BOX_SPECIAL_PARAMS)
 					return false;
 				}
 				
-				if (strcasecmp(dom_string_data(c2_name),
-						"option") == 0) {
+				if (dom_string_caseless_lwc_isequal(c2_name,
+						corestring_lwc_option)) {
 					dom_string_unref(c2_name);
 
 					if (box_select_add_option(gadget, 
@@ -3051,7 +3079,7 @@ bool box_embed(BOX_SPECIAL_PARAMS)
 			return false;
 		}
 
-		if (strcasecmp(dom_string_data(name), "src") == 0) {
+		if (dom_string_caseless_lwc_isequal(name, corestring_lwc_src)) {
 			dom_string_unref(name);
 			continue;
 		}
diff --git a/utils/corestrings.c b/utils/corestrings.c
index 777940931..05c5ac632 100644
--- a/utils/corestrings.c
+++ b/utils/corestrings.c
@@ -46,6 +46,8 @@ lwc_string *corestring_lwc_div;
 lwc_string *corestring_lwc_embed;
 lwc_string *corestring_lwc_file;
 lwc_string *corestring_lwc_font;
+lwc_string *corestring_lwc_frame;
+lwc_string *corestring_lwc_frameset;
 lwc_string *corestring_lwc_h1;
 lwc_string *corestring_lwc_h2;
 lwc_string *corestring_lwc_h3;
@@ -66,9 +68,13 @@ lwc_string *corestring_lwc_link;
 lwc_string *corestring_lwc_meta;
 lwc_string *corestring_lwc_middle;
 lwc_string *corestring_lwc_multipart_form_data;
+lwc_string *corestring_lwc_no;
 lwc_string *corestring_lwc_noscript;
 lwc_string *corestring_lwc_object;
+lwc_string *corestring_lwc_optgroup;
+lwc_string *corestring_lwc_option;
 lwc_string *corestring_lwc_p;
+lwc_string *corestring_lwc_param;
 lwc_string *corestring_lwc_password;
 lwc_string *corestring_lwc_poly;
 lwc_string *corestring_lwc_polygon;
@@ -79,6 +85,7 @@ lwc_string *corestring_lwc_rectangle;
 lwc_string *corestring_lwc_refresh;
 lwc_string *corestring_lwc_reset;
 lwc_string *corestring_lwc_right;
+lwc_string *corestring_lwc_src;
 lwc_string *corestring_lwc_style;
 lwc_string *corestring_lwc_submit;
 lwc_string *corestring_lwc_table;
@@ -95,6 +102,7 @@ lwc_string *corestring_lwc_title;
 lwc_string *corestring_lwc_top;
 lwc_string *corestring_lwc_tr;
 lwc_string *corestring_lwc_url;
+lwc_string *corestring_lwc_yes;
 lwc_string *corestring_lwc__blank;
 lwc_string *corestring_lwc__parent;
 lwc_string *corestring_lwc__self;
@@ -175,6 +183,8 @@ void corestrings_fini(void)
 	CSS_LWC_STRING_UNREF(embed);
 	CSS_LWC_STRING_UNREF(file);
 	CSS_LWC_STRING_UNREF(font);
+	CSS_LWC_STRING_UNREF(frame);
+	CSS_LWC_STRING_UNREF(frameset);
 	CSS_LWC_STRING_UNREF(h1);
 	CSS_LWC_STRING_UNREF(h2);
 	CSS_LWC_STRING_UNREF(h3);
@@ -195,9 +205,13 @@ void corestrings_fini(void)
 	CSS_LWC_STRING_UNREF(meta);
 	CSS_LWC_STRING_UNREF(middle);
 	CSS_LWC_STRING_UNREF(multipart_form_data);
+	CSS_LWC_STRING_UNREF(no);
 	CSS_LWC_STRING_UNREF(noscript);
 	CSS_LWC_STRING_UNREF(object);
+	CSS_LWC_STRING_UNREF(optgroup);
+	CSS_LWC_STRING_UNREF(option);
 	CSS_LWC_STRING_UNREF(p);
+	CSS_LWC_STRING_UNREF(param);
 	CSS_LWC_STRING_UNREF(password);
 	CSS_LWC_STRING_UNREF(poly);
 	CSS_LWC_STRING_UNREF(polygon);
@@ -208,6 +222,7 @@ void corestrings_fini(void)
 	CSS_LWC_STRING_UNREF(refresh);
 	CSS_LWC_STRING_UNREF(reset);
 	CSS_LWC_STRING_UNREF(right);
+	CSS_LWC_STRING_UNREF(src);
 	CSS_LWC_STRING_UNREF(style);
 	CSS_LWC_STRING_UNREF(submit);
 	CSS_LWC_STRING_UNREF(table);
@@ -224,6 +239,7 @@ void corestrings_fini(void)
 	CSS_LWC_STRING_UNREF(top);
 	CSS_LWC_STRING_UNREF(tr);
 	CSS_LWC_STRING_UNREF(url);
+	CSS_LWC_STRING_UNREF(yes);
 	CSS_LWC_STRING_UNREF(_blank);
 	CSS_LWC_STRING_UNREF(_parent);
 	CSS_LWC_STRING_UNREF(_self);
@@ -324,6 +340,8 @@ nserror corestrings_init(void)
 	CSS_LWC_STRING_INTERN(embed);
 	CSS_LWC_STRING_INTERN(file);
 	CSS_LWC_STRING_INTERN(font);
+	CSS_LWC_STRING_INTERN(frame);
+	CSS_LWC_STRING_INTERN(frameset);
 	CSS_LWC_STRING_INTERN(h1);
 	CSS_LWC_STRING_INTERN(h2);
 	CSS_LWC_STRING_INTERN(h3);
@@ -343,9 +361,13 @@ nserror corestrings_init(void)
 	CSS_LWC_STRING_INTERN(link);
 	CSS_LWC_STRING_INTERN(meta);
 	CSS_LWC_STRING_INTERN(middle);
+	CSS_LWC_STRING_INTERN(no);
 	CSS_LWC_STRING_INTERN(noscript);
 	CSS_LWC_STRING_INTERN(object);
+	CSS_LWC_STRING_INTERN(optgroup);
+	CSS_LWC_STRING_INTERN(object);
 	CSS_LWC_STRING_INTERN(p);
+	CSS_LWC_STRING_INTERN(param);
 	CSS_LWC_STRING_INTERN(password);
 	CSS_LWC_STRING_INTERN(poly);
 	CSS_LWC_STRING_INTERN(polygon);
@@ -356,6 +378,7 @@ nserror corestrings_init(void)
 	CSS_LWC_STRING_INTERN(refresh);
 	CSS_LWC_STRING_INTERN(reset);
 	CSS_LWC_STRING_INTERN(right);
+	CSS_LWC_STRING_INTERN(src);
 	CSS_LWC_STRING_INTERN(style);
 	CSS_LWC_STRING_INTERN(submit);
 	CSS_LWC_STRING_INTERN(table);
@@ -371,12 +394,14 @@ nserror corestrings_init(void)
 	CSS_LWC_STRING_INTERN(top);
 	CSS_LWC_STRING_INTERN(tr);
 	CSS_LWC_STRING_INTERN(url);
+	CSS_LWC_STRING_INTERN(yes);
 	CSS_LWC_STRING_INTERN(_blank);
 	CSS_LWC_STRING_INTERN(_parent);
 	CSS_LWC_STRING_INTERN(_self);
 	CSS_LWC_STRING_INTERN(_top);
 #undef CSS_LWC_STRING_INTERN
 
+
 	lerror = lwc_intern_string("multipart/form-data",
 			SLEN("multipart/form-data"),
 			&corestring_lwc_multipart_form_data);
diff --git a/utils/corestrings.h b/utils/corestrings.h
index df289dfe0..a3bda1632 100644
--- a/utils/corestrings.h
+++ b/utils/corestrings.h
@@ -50,6 +50,8 @@ extern lwc_string *corestring_lwc_div;
 extern lwc_string *corestring_lwc_embed;
 extern lwc_string *corestring_lwc_file;
 extern lwc_string *corestring_lwc_font;
+extern lwc_string *corestring_lwc_frame;
+extern lwc_string *corestring_lwc_frameset;
 extern lwc_string *corestring_lwc_h1;
 extern lwc_string *corestring_lwc_h2;
 extern lwc_string *corestring_lwc_h3;
@@ -70,9 +72,13 @@ extern lwc_string *corestring_lwc_link;
 extern lwc_string *corestring_lwc_meta;
 extern lwc_string *corestring_lwc_middle;
 extern lwc_string *corestring_lwc_multipart_form_data;
+extern lwc_string *corestring_lwc_no;
 extern lwc_string *corestring_lwc_noscript;
 extern lwc_string *corestring_lwc_object;
+extern lwc_string *corestring_lwc_optgroup;
+extern lwc_string *corestring_lwc_option;
 extern lwc_string *corestring_lwc_p;
+extern lwc_string *corestring_lwc_param;
 extern lwc_string *corestring_lwc_password;
 extern lwc_string *corestring_lwc_poly;
 extern lwc_string *corestring_lwc_polygon;
@@ -83,6 +89,7 @@ extern lwc_string *corestring_lwc_rectangle;
 extern lwc_string *corestring_lwc_refresh;
 extern lwc_string *corestring_lwc_reset;
 extern lwc_string *corestring_lwc_right;
+extern lwc_string *corestring_lwc_src;
 extern lwc_string *corestring_lwc_style;
 extern lwc_string *corestring_lwc_submit;
 extern lwc_string *corestring_lwc_table;
@@ -99,6 +106,7 @@ extern lwc_string *corestring_lwc_title;
 extern lwc_string *corestring_lwc_top;
 extern lwc_string *corestring_lwc_tr;
 extern lwc_string *corestring_lwc_url;
+extern lwc_string *corestring_lwc_yes;
 extern lwc_string *corestring_lwc__blank;
 extern lwc_string *corestring_lwc__parent;
 extern lwc_string *corestring_lwc__self;