diff --git a/render/box.h b/render/box.h
index 878ebc8d3..e781a66ec 100644
--- a/render/box.h
+++ b/render/box.h
@@ -339,8 +339,6 @@ bool box_handle_scrollbars(struct content *c, struct box *box,
 bool box_vscrollbar_present(const struct box *box);
 bool box_hscrollbar_present(const struct box *box);
 
-nserror box_construct_init(void);
-void box_construct_fini(void);
 nserror dom_to_box(struct dom_node *n, struct html_content *c,
 		box_construct_complete_cb cb);
 
diff --git a/render/box_construct.c b/render/box_construct.c
index 3d077e8cd..ce21b70f7 100644
--- a/render/box_construct.c
+++ b/render/box_construct.c
@@ -210,134 +210,13 @@ static const box_type box_map[] = {
 	BOX_NONE /*CSS_DISPLAY_NONE*/
 };
 
-/** Key for box userdata on DOM elements (== '__ns_box') */
-static dom_string *kstr_box_key;
-static dom_string *kstr_title;
-static dom_string *kstr_id;
-static dom_string *kstr_colspan;
-static dom_string *kstr_rowspan;
-static dom_string *kstr_style;
-static dom_string *kstr_href;
-static dom_string *kstr_name;
-static dom_string *kstr_target;
-static dom_string *kstr_alt;
-static dom_string *kstr_src;
-static dom_string *kstr_codebase;
-static dom_string *kstr_classid;
-static dom_string *kstr_data;
-static dom_string *kstr_rows;
-static dom_string *kstr_cols;
-static dom_string *kstr_border;
-static dom_string *kstr_frameborder;
-static dom_string *kstr_bordercolor;
-static dom_string *kstr_noresize;
-static dom_string *kstr_scrolling;
-static dom_string *kstr_marginwidth;
-static dom_string *kstr_marginheight;
-static dom_string *kstr_type;
-static dom_string *kstr_value;
-static dom_string *kstr_selected;
-
-nserror box_construct_init(void)
-{
-	dom_exception err;
-
-	err = dom_string_create_interned((const uint8_t *) "__ns_box",
-				SLEN("__ns_box"), &kstr_box_key);
-	if (err != DOM_NO_ERR || kstr_box_key == NULL)
-		goto error;
-
-#define BOX_CONSTRUCT_STRING_INTERN(NAME)				\
-	err = dom_string_create_interned((const uint8_t *)#NAME,	\
-					 sizeof(#NAME) - 1,		\
-					 &kstr_##NAME );		\
-	if ((err != DOM_NO_ERR) || (kstr_##NAME == NULL))		\
-		goto error						
-
-	BOX_CONSTRUCT_STRING_INTERN(title);
-	BOX_CONSTRUCT_STRING_INTERN(id);
-	BOX_CONSTRUCT_STRING_INTERN(colspan);
-	BOX_CONSTRUCT_STRING_INTERN(rowspan);
-	BOX_CONSTRUCT_STRING_INTERN(style);
-	BOX_CONSTRUCT_STRING_INTERN(href);
-	BOX_CONSTRUCT_STRING_INTERN(name);
-	BOX_CONSTRUCT_STRING_INTERN(target);
-	BOX_CONSTRUCT_STRING_INTERN(alt);
-	BOX_CONSTRUCT_STRING_INTERN(src);
-	BOX_CONSTRUCT_STRING_INTERN(codebase);
-	BOX_CONSTRUCT_STRING_INTERN(classid);
-	BOX_CONSTRUCT_STRING_INTERN(data);
-	BOX_CONSTRUCT_STRING_INTERN(rows);
-	BOX_CONSTRUCT_STRING_INTERN(cols);
-	BOX_CONSTRUCT_STRING_INTERN(border);
-	BOX_CONSTRUCT_STRING_INTERN(frameborder);
-	BOX_CONSTRUCT_STRING_INTERN(bordercolor);
-	BOX_CONSTRUCT_STRING_INTERN(noresize);
-	BOX_CONSTRUCT_STRING_INTERN(scrolling);
-	BOX_CONSTRUCT_STRING_INTERN(marginwidth);
-	BOX_CONSTRUCT_STRING_INTERN(marginheight);
-	BOX_CONSTRUCT_STRING_INTERN(type);
-	BOX_CONSTRUCT_STRING_INTERN(value);
-	BOX_CONSTRUCT_STRING_INTERN(selected);
-
-#undef BOX_CONSTRUCT_STRING_INTERN
-
-	return NSERROR_OK;
-
-error:
-	return NSERROR_NOMEM;
-}
-
-void box_construct_fini(void)
-{
-	if (kstr_box_key != NULL) {
-		dom_string_unref(kstr_box_key);
-		kstr_box_key = NULL;
-	}
-
-#define BOX_CONSTRUCT_STRING_UNREF(NAME)				\
-	do {								\
-		if (kstr_##NAME != NULL) {				\
-			dom_string_unref(kstr_##NAME);			\
-			kstr_##NAME = NULL;				\
-		}							\
-	} while (0)							\
-
-	BOX_CONSTRUCT_STRING_UNREF(title);
-	BOX_CONSTRUCT_STRING_UNREF(id);
-	BOX_CONSTRUCT_STRING_UNREF(colspan);
-	BOX_CONSTRUCT_STRING_UNREF(rowspan);
-	BOX_CONSTRUCT_STRING_UNREF(style);
-	BOX_CONSTRUCT_STRING_UNREF(href);
-	BOX_CONSTRUCT_STRING_UNREF(name);
-	BOX_CONSTRUCT_STRING_UNREF(target);
-	BOX_CONSTRUCT_STRING_UNREF(alt);
-	BOX_CONSTRUCT_STRING_UNREF(src);
-	BOX_CONSTRUCT_STRING_UNREF(codebase);
-	BOX_CONSTRUCT_STRING_UNREF(classid);
-	BOX_CONSTRUCT_STRING_UNREF(data);
-	BOX_CONSTRUCT_STRING_UNREF(rows);
-	BOX_CONSTRUCT_STRING_UNREF(cols);
-	BOX_CONSTRUCT_STRING_UNREF(border);
-	BOX_CONSTRUCT_STRING_UNREF(frameborder);
-	BOX_CONSTRUCT_STRING_UNREF(bordercolor);
-	BOX_CONSTRUCT_STRING_UNREF(noresize);
-	BOX_CONSTRUCT_STRING_UNREF(scrolling);
-	BOX_CONSTRUCT_STRING_UNREF(marginwidth);
-	BOX_CONSTRUCT_STRING_UNREF(marginheight);
-	BOX_CONSTRUCT_STRING_UNREF(type);
-	BOX_CONSTRUCT_STRING_UNREF(value);
-	BOX_CONSTRUCT_STRING_UNREF(selected);
-
-#undef BOX_CONSTRUCT_DOM_STRING_UNREF
-}
-
 static inline struct box *box_for_node(dom_node *n)
 {
 	struct box *box = NULL;
 	dom_exception err;
 
-	err = dom_node_get_user_data(n, kstr_box_key, (void *) &box);
+	err = dom_node_get_user_data(n, corestring_dom___ns_key_box_node_data,
+			(void *) &box);
 	if (err != DOM_NO_ERR)
 		return NULL;
 
@@ -859,7 +738,7 @@ bool box_construct_element(struct box_construct_ctx *ctx,
 		return false;
 
 	/* Extract title attribute, if present */
-	err = dom_element_get_attribute(ctx->n, kstr_title, &title0);
+	err = dom_element_get_attribute(ctx->n, corestring_dom_title, &title0);
 	if (err != DOM_NO_ERR)
 		return false;
 
@@ -880,7 +759,7 @@ bool box_construct_element(struct box_construct_ctx *ctx,
 	}
 
 	/* Extract id attribute, if present */
-	err = dom_element_get_attribute(ctx->n, kstr_id, &s);
+	err = dom_element_get_attribute(ctx->n, corestring_dom_id, &s);
 	if (err != DOM_NO_ERR)
 		return false;
 
@@ -903,7 +782,7 @@ bool box_construct_element(struct box_construct_ctx *ctx,
 		ctx->root_box = box;
 
 	/* Deal with colspan/rowspan */
-	err = dom_element_get_attribute(ctx->n, kstr_colspan, &s);
+	err = dom_element_get_attribute(ctx->n, corestring_dom_colspan, &s);
 	if (err != DOM_NO_ERR)
 		return false;
 
@@ -916,7 +795,7 @@ bool box_construct_element(struct box_construct_ctx *ctx,
 		dom_string_unref(s);
 	}
 
-	err = dom_element_get_attribute(ctx->n, kstr_rowspan, &s);
+	err = dom_element_get_attribute(ctx->n, corestring_dom_rowspan, &s);
 	if (err != DOM_NO_ERR)
 		return false;
 
@@ -1000,7 +879,8 @@ bool box_construct_element(struct box_construct_ctx *ctx,
 	}
 
 	/* Attach DOM node to box */
-	err = dom_node_set_user_data(ctx->n, kstr_box_key, box, NULL, 
+	err = dom_node_set_user_data(ctx->n,
+			corestring_dom___ns_key_box_node_data, box, NULL, 
 			(void *) &old_box);
 	if (err != DOM_NO_ERR)
 		return false;
@@ -1433,7 +1313,7 @@ css_select_results *box_get_style(html_content *c,
 	nscss_select_ctx ctx;
 
 	/* Firstly, construct inline stylesheet, if any */
-	err = dom_element_get_attribute(n, kstr_style, &s);
+	err = dom_element_get_attribute(n, corestring_dom_style, &s);
 	if (err != DOM_NO_ERR)
 		return NULL;
 
@@ -1575,7 +1455,7 @@ bool box_a(BOX_SPECIAL_PARAMS)
 	dom_string *s;
 	dom_exception err;
 
-	err = dom_element_get_attribute(n, kstr_href, &s);
+	err = dom_element_get_attribute(n, corestring_dom_href, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		ok = box_extract_link(dom_string_data(s),
 				content->base_url, &url);
@@ -1590,7 +1470,7 @@ bool box_a(BOX_SPECIAL_PARAMS)
 	}
 
 	/* name and id share the same namespace */
-	err = dom_element_get_attribute(n, kstr_name, &s);
+	err = dom_element_get_attribute(n, corestring_dom_name, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		lwc_string *lwc_name;
 
@@ -1609,7 +1489,7 @@ bool box_a(BOX_SPECIAL_PARAMS)
 	}
 
 	/* target frame [16.3] */
-	err = dom_element_get_attribute(n, kstr_target, &s);
+	err = dom_element_get_attribute(n, corestring_dom_target, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		if (dom_string_caseless_lwc_isequal(s,
 				corestring_lwc__blank))
@@ -1663,7 +1543,7 @@ bool box_image(BOX_SPECIAL_PARAMS)
 		return true;
 
 	/* handle alt text */
-	err = dom_element_get_attribute(n, kstr_alt, &s);
+	err = dom_element_get_attribute(n, corestring_dom_alt, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		char *alt = squash_whitespace(dom_string_data(s));
 		dom_string_unref(s);
@@ -1687,7 +1567,7 @@ bool box_image(BOX_SPECIAL_PARAMS)
 		box->usemap++;
 
 	/* get image URL */
-	err = dom_element_get_attribute(n, kstr_src, &s);
+	err = dom_element_get_attribute(n, corestring_dom_src, &s);
 	if (err != DOM_NO_ERR || s == NULL)
 		return true;
 
@@ -1790,7 +1670,7 @@ bool box_object(BOX_SPECIAL_PARAMS)
 
 	/* codebase, classid, and data are URLs
 	 * (codebase is the base for the other two) */
-	err = dom_element_get_attribute(n, kstr_codebase, &codebase);
+	err = dom_element_get_attribute(n, corestring_dom_codebase, &codebase);
 	if (err == DOM_NO_ERR && codebase != NULL) {
 		if (box_extract_link(dom_string_data(codebase), 
 				content->base_url, 
@@ -1803,7 +1683,7 @@ bool box_object(BOX_SPECIAL_PARAMS)
 	if (params->codebase == NULL)
 		params->codebase = nsurl_ref(content->base_url);
 
-	err = dom_element_get_attribute(n, kstr_classid, &classid);
+	err = dom_element_get_attribute(n, corestring_dom_classid, &classid);
 	if (err == DOM_NO_ERR && classid != NULL) {
 		if (box_extract_link(dom_string_data(classid), params->codebase,
 				&params->classid) == false) {
@@ -1813,7 +1693,7 @@ bool box_object(BOX_SPECIAL_PARAMS)
 		dom_string_unref(classid);
 	}
 
-	err = dom_element_get_attribute(n, kstr_data, &data);
+	err = dom_element_get_attribute(n, corestring_dom_data, &data);
 	if (err == DOM_NO_ERR && data != NULL) {
 		if (box_extract_link(dom_string_data(data), params->codebase,
 				&params->data) == false) {
@@ -2052,7 +1932,7 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 	colour default_border_colour = 0x000000;
 
 	/* parse rows and columns */
-	err = dom_element_get_attribute(n, kstr_rows, &s);
+	err = dom_element_get_attribute(n, corestring_dom_rows, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		row_height = box_parse_multi_lengths(dom_string_data(s), &rows);
 		dom_string_unref(s);
@@ -2066,7 +1946,7 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 		row_height->unit = FRAME_DIMENSION_PERCENT;
 	}
 
-	err = dom_element_get_attribute(n, kstr_cols, &s);
+	err = dom_element_get_attribute(n, corestring_dom_cols, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		col_width = box_parse_multi_lengths(dom_string_data(s), &cols);
 		dom_string_unref(s);
@@ -2085,7 +1965,7 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 	}
 
 	/* common extension: border="0|1" to control all children */
-	err = dom_element_get_attribute(n, kstr_border, &s);
+	err = dom_element_get_attribute(n, corestring_dom_border, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		if ((dom_string_data(s)[0] == '0') && 
 				(dom_string_data(s)[1] == '\0'))
@@ -2094,7 +1974,7 @@ 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);
+	err = dom_element_get_attribute(n, corestring_dom_frameborder, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 	  	if (dom_string_caseless_lwc_isequal(s,
 	  			corestring_lwc_no) == 0)
@@ -2104,7 +1984,7 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 
 	/* common extension: bordercolor="#RRGGBB|<named colour>" to control
 	 *all children */
-	err = dom_element_get_attribute(n, kstr_bordercolor, &s);
+	err = dom_element_get_attribute(n, corestring_dom_bordercolor, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		css_color color;
 
@@ -2233,7 +2113,7 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 
 			/* get frame URL (not required) */
 			url = NULL;
-			err = dom_element_get_attribute(c, kstr_src, &s);
+			err = dom_element_get_attribute(c, corestring_dom_src, &s);
 			if (err == DOM_NO_ERR && s != NULL) {
 				box_extract_link(dom_string_data(s), 
 						content->base_url, &url);
@@ -2250,17 +2130,17 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 			}
 
 			/* fill in specified values */
-			err = dom_element_get_attribute(c, kstr_name, &s);
+			err = dom_element_get_attribute(c, corestring_dom_name, &s);
 			if (err == DOM_NO_ERR && s != NULL) {
 				frame->name = talloc_strdup(content->bctx, 
 						dom_string_data(s));
 				dom_string_unref(s);
 			}
 
-			dom_element_has_attribute(c, kstr_noresize, 
+			dom_element_has_attribute(c, corestring_dom_noresize, 
 					&frame->no_resize);
 
-			err = dom_element_get_attribute(c, kstr_frameborder, 
+			err = dom_element_get_attribute(c, corestring_dom_frameborder, 
 					&s);
 			if (err == DOM_NO_ERR && s != NULL) {
 				i = atoi(dom_string_data(s));
@@ -2268,7 +2148,7 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 				dom_string_unref(s);
 			}
 
-			err = dom_element_get_attribute(c, kstr_scrolling, &s);
+			err = dom_element_get_attribute(c, corestring_dom_scrolling, &s);
 			if (err == DOM_NO_ERR && s != NULL) {
 				if (dom_string_caseless_lwc_isequal(s,
 						corestring_lwc_yes))
@@ -2279,21 +2159,21 @@ bool box_create_frameset(struct content_html_frames *f, dom_node *n,
 				dom_string_unref(s);
 			}
 
-			err = dom_element_get_attribute(c, kstr_marginwidth, 
+			err = dom_element_get_attribute(c, corestring_dom_marginwidth, 
 					&s);
 			if (err == DOM_NO_ERR && s != NULL) {
 				frame->margin_width = atoi(dom_string_data(s));
 				dom_string_unref(s);
 			}
 
-			err = dom_element_get_attribute(c, kstr_marginheight,
+			err = dom_element_get_attribute(c, corestring_dom_marginheight,
 					&s);
 			if (err == DOM_NO_ERR && s != NULL) {
 				frame->margin_height = atoi(dom_string_data(s));
 				dom_string_unref(s);
 			}
 
-			err = dom_element_get_attribute(c, kstr_bordercolor, 
+			err = dom_element_get_attribute(c, corestring_dom_bordercolor, 
 					&s);
 			if (err == DOM_NO_ERR && s != NULL) {
 				css_color color;
@@ -2363,7 +2243,7 @@ bool box_iframe(BOX_SPECIAL_PARAMS)
 		return true;
 
 	/* get frame URL */
-	err = dom_element_get_attribute(n, kstr_src, &s);
+	err = dom_element_get_attribute(n, corestring_dom_src, &s);
 	if (err != DOM_NO_ERR || s == NULL)
 		return true;
 	if (box_extract_link(dom_string_data(s), content->base_url, 
@@ -2403,20 +2283,20 @@ bool box_iframe(BOX_SPECIAL_PARAMS)
 	content->iframe = iframe;
 
 	/* fill in specified values */
-	err = dom_element_get_attribute(n, kstr_name, &s);
+	err = dom_element_get_attribute(n, corestring_dom_name, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		iframe->name = talloc_strdup(content->bctx, dom_string_data(s));
 		dom_string_unref(s);
 	}
 
-	err = dom_element_get_attribute(n, kstr_frameborder, &s);
+	err = dom_element_get_attribute(n, corestring_dom_frameborder, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		i = atoi(dom_string_data(s));
 		iframe->border = (i != 0);
 		dom_string_unref(s);
 	}
 
-	err = dom_element_get_attribute(n, kstr_bordercolor, &s);
+	err = dom_element_get_attribute(n, corestring_dom_bordercolor, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		css_color color;
 
@@ -2426,7 +2306,7 @@ bool box_iframe(BOX_SPECIAL_PARAMS)
 		dom_string_unref(s);
 	}
 
-	err = dom_element_get_attribute(n, kstr_scrolling, &s);
+	err = dom_element_get_attribute(n, corestring_dom_scrolling, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		if (dom_string_caseless_lwc_isequal(s,
 				corestring_lwc_yes))
@@ -2437,13 +2317,13 @@ bool box_iframe(BOX_SPECIAL_PARAMS)
 		dom_string_unref(s);
 	}
 
-	err = dom_element_get_attribute(n, kstr_marginwidth, &s);
+	err = dom_element_get_attribute(n, corestring_dom_marginwidth, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		iframe->margin_width = atoi(dom_string_data(s));
 		dom_string_unref(s);
 	}
 
-	err = dom_element_get_attribute(n, kstr_marginheight, &s);
+	err = dom_element_get_attribute(n, corestring_dom_marginheight, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		iframe->margin_height = atoi(dom_string_data(s));
 		dom_string_unref(s);
@@ -2504,7 +2384,7 @@ bool box_input(BOX_SPECIAL_PARAMS)
 	nsurl *url;
 	nserror error;
 
-	dom_element_get_attribute(n, kstr_type, &type);
+	dom_element_get_attribute(n, corestring_dom_type, &type);
 
 	gadget = html_forms_get_control_for_node(content->forms, n);
 	if (gadget == NULL)
@@ -2589,7 +2469,7 @@ bool box_input(BOX_SPECIAL_PARAMS)
 		    nsoption_bool(foreground_images) == true) {
 			dom_string *s;
 
-			err = dom_element_get_attribute(n, kstr_src, &s);
+			err = dom_element_get_attribute(n, corestring_dom_src, &s);
 			if (err == DOM_NO_ERR && s != NULL) {
 				error = nsurl_join(content->base_url, 
 						dom_string_data(s), &url);
@@ -2837,7 +2717,7 @@ bool box_select_add_option(struct form_control *control, dom_node *n)
 	if (text == NULL)
 		goto no_memory;
 
-	err = dom_element_get_attribute(n, kstr_value, &s);
+	err = dom_element_get_attribute(n, corestring_dom_value, &s);
 	if (err == DOM_NO_ERR && s != NULL) {
 		value = strdup(dom_string_data(s));
 		dom_string_unref(s);
@@ -2848,7 +2728,7 @@ bool box_select_add_option(struct form_control *control, dom_node *n)
 	if (value == NULL)
 		goto no_memory;
 
-	dom_element_has_attribute(n, kstr_selected, &selected);
+	dom_element_has_attribute(n, corestring_dom_selected, &selected);
 
 	/* replace spaces/TABs with hard spaces to prevent line wrapping */
 	text_nowrap = cnv_space2nbsp(text);
@@ -2924,7 +2804,7 @@ bool box_embed(BOX_SPECIAL_PARAMS)
 	params->params = NULL;
 
 	/* src is a URL */
-	err = dom_element_get_attribute(n, kstr_src, &src);
+	err = dom_element_get_attribute(n, corestring_dom_src, &src);
 	if (err != DOM_NO_ERR || src == NULL)
 		return true;
 	if (box_extract_link(dom_string_data(src), content->base_url, 
diff --git a/render/html.c b/render/html.c
index e10f1e930..0a7ab2453 100644
--- a/render/html.c
+++ b/render/html.c
@@ -2180,8 +2180,6 @@ static content_type html_content_type(void)
 
 static void html_fini(void)
 {
-	box_construct_fini();
-
 	html_css_fini();
 }
 
@@ -2221,10 +2219,6 @@ nserror html_init(void)
 	if (error != NSERROR_OK)
 		goto error;
 
-	error = box_construct_init();
-	if (error != NSERROR_OK)
-		goto error;
-
 	for (i = 0; i < NOF_ELEMENTS(html_types); i++) {
 		error = content_factory_register_handler(html_types[i],
 				&html_content_handler);
diff --git a/utils/corestrings.c b/utils/corestrings.c
index e60a75bdc..85bced5ab 100644
--- a/utils/corestrings.c
+++ b/utils/corestrings.c
@@ -116,6 +116,7 @@ lwc_string *corestring_lwc__top;
 
 /* dom_string strings */
 dom_string *corestring_dom_a;
+dom_string *corestring_dom_alt;
 dom_string *corestring_dom_abort;
 dom_string *corestring_dom_afterprint;
 dom_string *corestring_dom_align;
@@ -136,14 +137,18 @@ dom_string *corestring_dom_cellspacing;
 dom_string *corestring_dom_change;
 dom_string *corestring_dom_charset;
 dom_string *corestring_dom_class;
+dom_string *corestring_dom_classid;
 dom_string *corestring_dom_click;
 dom_string *corestring_dom_close;
+dom_string *corestring_dom_codebase;
 dom_string *corestring_dom_color;
 dom_string *corestring_dom_cols;
+dom_string *corestring_dom_colspan;
 dom_string *corestring_dom_content;
 dom_string *corestring_dom_contextmenu;
 dom_string *corestring_dom_coords;
 dom_string *corestring_dom_cuechange;
+dom_string *corestring_dom_data;
 dom_string *corestring_dom_dblclick;
 dom_string *corestring_dom_defer;
 dom_string *corestring_dom_DOMAttrModified;
@@ -162,6 +167,7 @@ dom_string *corestring_dom_emptied;
 dom_string *corestring_dom_ended;
 dom_string *corestring_dom_error;
 dom_string *corestring_dom_focus;
+dom_string *corestring_dom_frameborder;
 dom_string *corestring_dom_hashchange;
 dom_string *corestring_dom_height;
 dom_string *corestring_dom_href;
@@ -180,6 +186,8 @@ dom_string *corestring_dom_loadeddata;
 dom_string *corestring_dom_loadedmetadata;
 dom_string *corestring_dom_loadstart;
 dom_string *corestring_dom_map;
+dom_string *corestring_dom_marginheight;
+dom_string *corestring_dom_marginwidth;
 dom_string *corestring_dom_media;
 dom_string *corestring_dom_message;
 dom_string *corestring_dom_mousedown;
@@ -190,6 +198,7 @@ dom_string *corestring_dom_mouseup;
 dom_string *corestring_dom_mousewheel;
 dom_string *corestring_dom_name;
 dom_string *corestring_dom_nohref;
+dom_string *corestring_dom_noresize;
 dom_string *corestring_dom_offline;
 dom_string *corestring_dom_online;
 dom_string *corestring_dom_pagehide;
@@ -206,10 +215,13 @@ dom_string *corestring_dom_rel;
 dom_string *corestring_dom_reset;
 dom_string *corestring_dom_resize;
 dom_string *corestring_dom_rows;
+dom_string *corestring_dom_rowspan;
 dom_string *corestring_dom_scroll;
+dom_string *corestring_dom_scrolling;
 dom_string *corestring_dom_seeked;
 dom_string *corestring_dom_seeking;
 dom_string *corestring_dom_select;
+dom_string *corestring_dom_selected;
 dom_string *corestring_dom_shape;
 dom_string *corestring_dom_show;
 dom_string *corestring_dom_size;
@@ -224,9 +236,11 @@ dom_string *corestring_dom_target;
 dom_string *corestring_dom_text;
 dom_string *corestring_dom_text_javascript;
 dom_string *corestring_dom_timeupdate;
+dom_string *corestring_dom_title;
 dom_string *corestring_dom_type;
 dom_string *corestring_dom_unload;
 dom_string *corestring_dom_valign;
+dom_string *corestring_dom_value;
 dom_string *corestring_dom_vlink;
 dom_string *corestring_dom_volumechange;
 dom_string *corestring_dom_vspace;
@@ -242,6 +256,7 @@ dom_string *corestring_dom_radio;
 dom_string *corestring_dom_checkbox;
 dom_string *corestring_dom_file;
 dom_string *corestring_dom_on;
+dom_string *corestring_dom___ns_key_box_node_data;
 dom_string *corestring_dom___ns_key_libcss_node_data;
 dom_string *corestring_dom___ns_key_file_name_node_data;
 dom_string *corestring_dom___ns_key_image_coords_node_data;
@@ -361,6 +376,7 @@ void corestrings_fini(void)
 	CSS_DOM_STRING_UNREF(abort);
 	CSS_DOM_STRING_UNREF(afterprint);
 	CSS_DOM_STRING_UNREF(align);
+	CSS_DOM_STRING_UNREF(alt);
 	CSS_DOM_STRING_UNREF(area);
 	CSS_DOM_STRING_UNREF(async);
 	CSS_DOM_STRING_UNREF(background);
@@ -378,14 +394,18 @@ void corestrings_fini(void)
 	CSS_DOM_STRING_UNREF(change);
 	CSS_DOM_STRING_UNREF(charset);
 	CSS_DOM_STRING_UNREF(class);
+	CSS_DOM_STRING_UNREF(classid);
 	CSS_DOM_STRING_UNREF(click);
 	CSS_DOM_STRING_UNREF(close);
+	CSS_DOM_STRING_UNREF(codebase);
 	CSS_DOM_STRING_UNREF(color);
 	CSS_DOM_STRING_UNREF(cols);
+	CSS_DOM_STRING_UNREF(colspan);
 	CSS_DOM_STRING_UNREF(content);
 	CSS_DOM_STRING_UNREF(contextmenu);
 	CSS_DOM_STRING_UNREF(coords);
 	CSS_DOM_STRING_UNREF(cuechange);
+	CSS_DOM_STRING_UNREF(data);
 	CSS_DOM_STRING_UNREF(dblclick);
 	CSS_DOM_STRING_UNREF(defer);
 	CSS_DOM_STRING_UNREF(DOMAttrModified);
@@ -404,6 +424,7 @@ void corestrings_fini(void)
 	CSS_DOM_STRING_UNREF(ended);
 	CSS_DOM_STRING_UNREF(error);
 	CSS_DOM_STRING_UNREF(focus);
+	CSS_DOM_STRING_UNREF(frameborder);
 	CSS_DOM_STRING_UNREF(hashchange);
 	CSS_DOM_STRING_UNREF(height);
 	CSS_DOM_STRING_UNREF(href);
@@ -422,6 +443,8 @@ void corestrings_fini(void)
 	CSS_DOM_STRING_UNREF(loadedmetadata);
 	CSS_DOM_STRING_UNREF(loadstart);
 	CSS_DOM_STRING_UNREF(map);
+	CSS_DOM_STRING_UNREF(marginheight);
+	CSS_DOM_STRING_UNREF(marginwidth);
 	CSS_DOM_STRING_UNREF(media);
 	CSS_DOM_STRING_UNREF(message);
 	CSS_DOM_STRING_UNREF(mousedown);
@@ -432,6 +455,7 @@ void corestrings_fini(void)
 	CSS_DOM_STRING_UNREF(mousewheel);
 	CSS_DOM_STRING_UNREF(name);
 	CSS_DOM_STRING_UNREF(nohref);
+	CSS_DOM_STRING_UNREF(noresize);
 	CSS_DOM_STRING_UNREF(offline);
 	CSS_DOM_STRING_UNREF(online);
 	CSS_DOM_STRING_UNREF(pagehide);
@@ -448,10 +472,13 @@ void corestrings_fini(void)
 	CSS_DOM_STRING_UNREF(reset);
 	CSS_DOM_STRING_UNREF(resize);
 	CSS_DOM_STRING_UNREF(rows);
+	CSS_DOM_STRING_UNREF(rowspan);
 	CSS_DOM_STRING_UNREF(scroll);
+	CSS_DOM_STRING_UNREF(scrolling);
 	CSS_DOM_STRING_UNREF(seeked);
 	CSS_DOM_STRING_UNREF(seeking);
 	CSS_DOM_STRING_UNREF(select);
+	CSS_DOM_STRING_UNREF(selected);
 	CSS_DOM_STRING_UNREF(shape);
 	CSS_DOM_STRING_UNREF(show);
 	CSS_DOM_STRING_UNREF(size);
@@ -466,9 +493,11 @@ void corestrings_fini(void)
 	CSS_DOM_STRING_UNREF(text);
 	CSS_DOM_STRING_UNREF(text_javascript);
 	CSS_DOM_STRING_UNREF(timeupdate);
+	CSS_DOM_STRING_UNREF(title);
 	CSS_DOM_STRING_UNREF(type);
 	CSS_DOM_STRING_UNREF(unload);
 	CSS_DOM_STRING_UNREF(valign);
+	CSS_DOM_STRING_UNREF(value);
 	CSS_DOM_STRING_UNREF(vlink);
 	CSS_DOM_STRING_UNREF(volumechange);
 	CSS_DOM_STRING_UNREF(vspace);
@@ -487,6 +516,7 @@ void corestrings_fini(void)
 	CSS_DOM_STRING_UNREF(file);
 	CSS_DOM_STRING_UNREF(on);
 	/* DOM userdata keys, not really CSS */
+	CSS_DOM_STRING_UNREF(__ns_key_box_node_data);
 	CSS_DOM_STRING_UNREF(__ns_key_libcss_node_data);
 	CSS_DOM_STRING_UNREF(__ns_key_file_name_node_data);
 	CSS_DOM_STRING_UNREF(__ns_key_image_coords_node_data);
@@ -638,6 +668,7 @@ nserror corestrings_init(void)
 	CSS_DOM_STRING_INTERN(abort);
 	CSS_DOM_STRING_INTERN(afterprint);
 	CSS_DOM_STRING_INTERN(align);
+	CSS_DOM_STRING_INTERN(alt);
 	CSS_DOM_STRING_INTERN(area);
 	CSS_DOM_STRING_INTERN(async);
 	CSS_DOM_STRING_INTERN(background);
@@ -655,14 +686,18 @@ nserror corestrings_init(void)
 	CSS_DOM_STRING_INTERN(change);
 	CSS_DOM_STRING_INTERN(charset);
 	CSS_DOM_STRING_INTERN(class);
+	CSS_DOM_STRING_INTERN(classid);
 	CSS_DOM_STRING_INTERN(click);
 	CSS_DOM_STRING_INTERN(close);
+	CSS_DOM_STRING_INTERN(codebase);
 	CSS_DOM_STRING_INTERN(color);
 	CSS_DOM_STRING_INTERN(cols);
+	CSS_DOM_STRING_INTERN(colspan);
 	CSS_DOM_STRING_INTERN(content);
 	CSS_DOM_STRING_INTERN(contextmenu);
 	CSS_DOM_STRING_INTERN(coords);
 	CSS_DOM_STRING_INTERN(cuechange);
+	CSS_DOM_STRING_INTERN(data);
 	CSS_DOM_STRING_INTERN(dblclick);
 	CSS_DOM_STRING_INTERN(defer);
 	CSS_DOM_STRING_INTERN(DOMAttrModified);
@@ -681,6 +716,7 @@ nserror corestrings_init(void)
 	CSS_DOM_STRING_INTERN(ended);
 	CSS_DOM_STRING_INTERN(error);
 	CSS_DOM_STRING_INTERN(focus);
+	CSS_DOM_STRING_INTERN(frameborder);
 	CSS_DOM_STRING_INTERN(hashchange);
 	CSS_DOM_STRING_INTERN(height);
 	CSS_DOM_STRING_INTERN(href);
@@ -699,6 +735,8 @@ nserror corestrings_init(void)
 	CSS_DOM_STRING_INTERN(loadedmetadata);
 	CSS_DOM_STRING_INTERN(loadstart);
 	CSS_DOM_STRING_INTERN(map);
+	CSS_DOM_STRING_INTERN(marginheight);
+	CSS_DOM_STRING_INTERN(marginwidth);
 	CSS_DOM_STRING_INTERN(media);
 	CSS_DOM_STRING_INTERN(message);
 	CSS_DOM_STRING_INTERN(mousedown);
@@ -709,6 +747,7 @@ nserror corestrings_init(void)
 	CSS_DOM_STRING_INTERN(mousewheel);
 	CSS_DOM_STRING_INTERN(name);
 	CSS_DOM_STRING_INTERN(nohref);
+	CSS_DOM_STRING_INTERN(noresize);
 	CSS_DOM_STRING_INTERN(offline);
 	CSS_DOM_STRING_INTERN(online);
 	CSS_DOM_STRING_INTERN(pagehide);
@@ -725,10 +764,13 @@ nserror corestrings_init(void)
 	CSS_DOM_STRING_INTERN(reset);
 	CSS_DOM_STRING_INTERN(resize);
 	CSS_DOM_STRING_INTERN(rows);
+	CSS_DOM_STRING_INTERN(rowspan);
 	CSS_DOM_STRING_INTERN(scroll);
+	CSS_DOM_STRING_INTERN(scrolling);
 	CSS_DOM_STRING_INTERN(seeked);
 	CSS_DOM_STRING_INTERN(seeking);
 	CSS_DOM_STRING_INTERN(select);
+	CSS_DOM_STRING_INTERN(selected);
 	CSS_DOM_STRING_INTERN(shape);
 	CSS_DOM_STRING_INTERN(show);
 	CSS_DOM_STRING_INTERN(size);
@@ -742,9 +784,11 @@ nserror corestrings_init(void)
 	CSS_DOM_STRING_INTERN(target);
 	CSS_DOM_STRING_INTERN(text);
 	CSS_DOM_STRING_INTERN(timeupdate);
+	CSS_DOM_STRING_INTERN(title);
 	CSS_DOM_STRING_INTERN(type);
 	CSS_DOM_STRING_INTERN(unload);
 	CSS_DOM_STRING_INTERN(valign);
+	CSS_DOM_STRING_INTERN(value);
 	CSS_DOM_STRING_INTERN(vlink);
 	CSS_DOM_STRING_INTERN(volumechange);
 	CSS_DOM_STRING_INTERN(vspace);
@@ -763,6 +807,7 @@ nserror corestrings_init(void)
 	CSS_DOM_STRING_INTERN(file);
 	CSS_DOM_STRING_INTERN(on);
 	/* DOM userdata keys, not really CSS */
+	CSS_DOM_STRING_INTERN(__ns_key_box_node_data);
 	CSS_DOM_STRING_INTERN(__ns_key_libcss_node_data);
 	CSS_DOM_STRING_INTERN(__ns_key_file_name_node_data);
 	CSS_DOM_STRING_INTERN(__ns_key_image_coords_node_data);
diff --git a/utils/corestrings.h b/utils/corestrings.h
index 90fef5aaa..411f9cef2 100644
--- a/utils/corestrings.h
+++ b/utils/corestrings.h
@@ -122,6 +122,7 @@ struct dom_string;
 
 /* dom_string strings */
 extern struct dom_string *corestring_dom_a;
+extern struct dom_string *corestring_dom_alt;
 extern struct dom_string *corestring_dom_abort;
 extern struct dom_string *corestring_dom_afterprint;
 extern struct dom_string *corestring_dom_align;
@@ -142,14 +143,18 @@ extern struct dom_string *corestring_dom_cellspacing;
 extern struct dom_string *corestring_dom_change;
 extern struct dom_string *corestring_dom_charset;
 extern struct dom_string *corestring_dom_class;
+extern struct dom_string *corestring_dom_classid;
 extern struct dom_string *corestring_dom_click;
 extern struct dom_string *corestring_dom_close;
+extern struct dom_string *corestring_dom_codebase;
 extern struct dom_string *corestring_dom_color;
 extern struct dom_string *corestring_dom_cols;
+extern struct dom_string *corestring_dom_colspan;
 extern struct dom_string *corestring_dom_content;
 extern struct dom_string *corestring_dom_contextmenu;
 extern struct dom_string *corestring_dom_coords;
 extern struct dom_string *corestring_dom_cuechange;
+extern struct dom_string *corestring_dom_data;
 extern struct dom_string *corestring_dom_dblclick;
 extern struct dom_string *corestring_dom_defer;
 extern struct dom_string *corestring_dom_DOMAttrModified;
@@ -168,6 +173,7 @@ extern struct dom_string *corestring_dom_emptied;
 extern struct dom_string *corestring_dom_ended;
 extern struct dom_string *corestring_dom_error;
 extern struct dom_string *corestring_dom_focus;
+extern struct dom_string *corestring_dom_frameborder;
 extern struct dom_string *corestring_dom_hashchange;
 extern struct dom_string *corestring_dom_height;
 extern struct dom_string *corestring_dom_href;
@@ -186,6 +192,8 @@ extern struct dom_string *corestring_dom_loadeddata;
 extern struct dom_string *corestring_dom_loadedmetadata;
 extern struct dom_string *corestring_dom_loadstart;
 extern struct dom_string *corestring_dom_map;
+extern struct dom_string *corestring_dom_marginheight;
+extern struct dom_string *corestring_dom_marginwidth;
 extern struct dom_string *corestring_dom_media;
 extern struct dom_string *corestring_dom_message;
 extern struct dom_string *corestring_dom_mousedown;
@@ -196,6 +204,7 @@ extern struct dom_string *corestring_dom_mouseup;
 extern struct dom_string *corestring_dom_mousewheel;
 extern struct dom_string *corestring_dom_name;
 extern struct dom_string *corestring_dom_nohref;
+extern struct dom_string *corestring_dom_noresize;
 extern struct dom_string *corestring_dom_offline;
 extern struct dom_string *corestring_dom_online;
 extern struct dom_string *corestring_dom_pagehide;
@@ -212,10 +221,13 @@ extern struct dom_string *corestring_dom_rel;
 extern struct dom_string *corestring_dom_reset;
 extern struct dom_string *corestring_dom_resize;
 extern struct dom_string *corestring_dom_rows;
+extern struct dom_string *corestring_dom_rowspan;
 extern struct dom_string *corestring_dom_scroll;
+extern struct dom_string *corestring_dom_scrolling;
 extern struct dom_string *corestring_dom_seeked;
 extern struct dom_string *corestring_dom_seeking;
 extern struct dom_string *corestring_dom_select;
+extern struct dom_string *corestring_dom_selected;
 extern struct dom_string *corestring_dom_shape;
 extern struct dom_string *corestring_dom_show;
 extern struct dom_string *corestring_dom_size;
@@ -230,9 +242,11 @@ extern struct dom_string *corestring_dom_target;
 extern struct dom_string *corestring_dom_text;
 extern struct dom_string *corestring_dom_text_javascript;
 extern struct dom_string *corestring_dom_timeupdate;
+extern struct dom_string *corestring_dom_title;
 extern struct dom_string *corestring_dom_type;
 extern struct dom_string *corestring_dom_unload;
 extern struct dom_string *corestring_dom_valign;
+extern struct dom_string *corestring_dom_value;
 extern struct dom_string *corestring_dom_vlink;
 extern struct dom_string *corestring_dom_volumechange;
 extern struct dom_string *corestring_dom_vspace;
@@ -253,6 +267,7 @@ extern struct dom_string *corestring_dom_checkbox;
 extern struct dom_string *corestring_dom_file;
 extern struct dom_string *corestring_dom_on;
 /* DOM userdata keys */
+extern struct dom_string *corestring_dom___ns_key_box_node_data;
 extern struct dom_string *corestring_dom___ns_key_libcss_node_data;
 extern struct dom_string *corestring_dom___ns_key_file_name_node_data;
 extern struct dom_string *corestring_dom___ns_key_image_coords_node_data;