diff --git a/src/ecmascript/mujs/Makefile b/src/ecmascript/mujs/Makefile
index 778f7c1ad..f4074ab95 100644
--- a/src/ecmascript/mujs/Makefile
+++ b/src/ecmascript/mujs/Makefile
@@ -1,7 +1,7 @@
 top_builddir=../../..
 include $(top_builddir)/Makefile.config
 
-OBJS = attr.o attributes.o collection.o console.o document.o element.o form.o forms.o history.o implementation.o input.o \
+OBJS = attr.o attributes.o collection.o console.o css.o document.o element.o form.o forms.o history.o implementation.o input.o \
 	keyboard.o localstorage.o location.o mapa.o message.o navigator.o nodelist.o screen.o style.o unibar.o window.o xhr.o
 
 include $(top_srcdir)/Makefile.lib
diff --git a/src/ecmascript/mujs/css.c b/src/ecmascript/mujs/css.c
new file mode 100644
index 000000000..3ebf552ce
--- /dev/null
+++ b/src/ecmascript/mujs/css.c
@@ -0,0 +1,113 @@
+/* The MuJS CSSStyleDeclaration object implementation. */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef CONFIG_LIBDOM
+#include <dom/dom.h>
+#include <dom/bindings/hubbub/parser.h>
+#endif
+
+#include "elinks.h"
+
+#include "document/libdom/corestrings.h"
+#include "ecmascript/ecmascript.h"
+#include "ecmascript/mujs/mapa.h"
+#include "ecmascript/mujs.h"
+#include "ecmascript/mujs/css.h"
+#include "ecmascript/mujs/element.h"
+
+static void
+mjs_CSSStyleDeclaration_get_property_length(js_State *J)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	js_pushnumber(J, 3); // fake
+}
+
+static void
+mjs_push_CSSStyleDeclaration_item2(js_State *J, int idx)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	js_pushstring(J, "0"); // fake
+}
+
+static void
+mjs_CSSStyleDeclaration_item(js_State *J)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	js_pushstring(J, "0"); // fake
+}
+
+static void
+mjs_push_CSSStyleDeclaration_namedItem2(js_State *J, const char *str)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	js_pushstring(J, "0"); // fake
+}
+
+static void
+mjs_CSSStyleDeclaration_namedItem(js_State *J)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	js_pushstring(J, "0");
+}
+
+static void
+mjs_CSSStyleDeclaration_set_items(js_State *J, void *node)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	js_pushstring(J, "0");
+	js_setproperty(J, -2, "marginTop");
+	js_pushstring(J, "0");
+	js_setproperty(J, -2, "marginLeft");
+	js_pushstring(J, "0");
+	js_setproperty(J, -2, "marginRight");
+}
+
+static void
+mjs_CSSStyleDeclaration_toString(js_State *J)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	js_pushstring(J, "[CSSStyleDeclaration object]");
+}
+
+static void
+mjs_CSSStyleDeclaration_finalizer(js_State *J, void *node)
+{
+}
+
+void
+mjs_push_CSSStyleDeclaration(js_State *J, void *node)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	js_newarray(J);
+	{
+		js_newuserdata(J, "CSSStyleDeclaration", node, mjs_CSSStyleDeclaration_finalizer);
+		addmethod(J, "item", mjs_CSSStyleDeclaration_item, 1);
+		addmethod(J, "namedItem", mjs_CSSStyleDeclaration_namedItem, 1);
+		addmethod(J, "toString", mjs_CSSStyleDeclaration_toString, 0);
+		addproperty(J, "length", mjs_CSSStyleDeclaration_get_property_length, NULL);
+		mjs_CSSStyleDeclaration_set_items(J, node);
+	}
+}
diff --git a/src/ecmascript/mujs/css.h b/src/ecmascript/mujs/css.h
new file mode 100644
index 000000000..2f0c57a43
--- /dev/null
+++ b/src/ecmascript/mujs/css.h
@@ -0,0 +1,16 @@
+#ifndef EL__ECMASCRIPT_MUJS_CSS_H
+#define EL__ECMASCRIPT_MUJS_CSS_H
+
+#include <mujs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void mjs_push_CSSStyleDeclaration(js_State *J, void *node);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/ecmascript/mujs/element.c b/src/ecmascript/mujs/element.c
index eabab1b21..9f0bdb651 100644
--- a/src/ecmascript/mujs/element.c
+++ b/src/ecmascript/mujs/element.c
@@ -72,7 +72,7 @@ struct mjs_element_private {
 	int ref_count;
 };
 
-static void *
+void *
 mjs_getprivate(js_State *J, int idx)
 {
 	struct mjs_element_private *priv = (struct mjs_element_private *)js_touserdata(J, idx, "element");
diff --git a/src/ecmascript/mujs/element.h b/src/ecmascript/mujs/element.h
index 0c2145303..a449c46bf 100644
--- a/src/ecmascript/mujs/element.h
+++ b/src/ecmascript/mujs/element.h
@@ -9,6 +9,7 @@ extern "C" {
 
 struct term_event;
 
+void *mjs_getprivate(js_State *J, int idx);
 int mjs_element_init(js_State *J);
 void mjs_push_element(js_State *J, void *node);
 void walk_tree(struct string *buf, void *nod, bool start, bool toSortAttrs);
diff --git a/src/ecmascript/mujs/meson.build b/src/ecmascript/mujs/meson.build
index 4db2186b8..6800f4bc1 100644
--- a/src/ecmascript/mujs/meson.build
+++ b/src/ecmascript/mujs/meson.build
@@ -1,2 +1,2 @@
-srcs += files('attr.c', 'attributes.c', 'collection.c', 'console.c', 'document.c', 'element.c', 'form.c', 'forms.c', 'history.c', 'implementation.c', 'input.c', 'keyboard.c',
+srcs += files('attr.c', 'attributes.c', 'collection.c', 'console.c', 'css.c', 'document.c', 'element.c', 'form.c', 'forms.c', 'history.c', 'implementation.c', 'input.c', 'keyboard.c',
 'localstorage.c', 'location.c', 'mapa.c', 'message.c', 'navigator.c', 'nodelist.c', 'screen.c', 'style.c', 'unibar.c', 'window.c', 'xhr.c')
diff --git a/src/ecmascript/mujs/window.c b/src/ecmascript/mujs/window.c
index 05ccd8b09..3393259cd 100644
--- a/src/ecmascript/mujs/window.c
+++ b/src/ecmascript/mujs/window.c
@@ -12,6 +12,11 @@
 #include <stdlib.h>
 #include <string.h>
 
+#ifdef CONFIG_LIBDOM
+#include <dom/dom.h>
+#include <dom/bindings/hubbub/parser.h>
+#endif
+
 #include "elinks.h"
 
 #include "bfu/dialog.h"
@@ -25,6 +30,8 @@
 #include "document/view.h"
 #include "ecmascript/ecmascript.h"
 #include "ecmascript/mujs.h"
+#include "ecmascript/mujs/css.h"
+#include "ecmascript/mujs/element.h"
 #include "ecmascript/mujs/keyboard.h"
 #include "ecmascript/mujs/location.h"
 #include "ecmascript/mujs/message.h"
@@ -295,6 +302,16 @@ mjs_window_clearTimeout(js_State *J)
 	js_pushundefined(J);
 }
 
+static void
+mjs_window_getComputedStyle(js_State *J)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	dom_node *el = (dom_node *)(mjs_getprivate(J, 1));
+	mjs_push_CSSStyleDeclaration(J, el);
+}
+
 static void
 mjs_window_open(js_State *J)
 {
@@ -678,6 +695,7 @@ mjs_window_init(js_State *J)
 		addmethod(J, "window.addEventListener", mjs_window_addEventListener, 3);
 		addmethod(J, "window.alert", mjs_window_alert, 1);
 		addmethod(J, "window.clearTimeout", mjs_window_clearTimeout, 1);
+		addmethod(J, "window.getComputedStyle", mjs_window_getComputedStyle, 2);
 		addmethod(J, "window.open", mjs_window_open, 3);
 		addmethod(J, "window.postMessage", mjs_window_postMessage, 3);
 		addmethod(J, "window.removeEventListener", mjs_window_removeEventListener, 3);