diff --git a/src/ecmascript/mujs/css.c b/src/ecmascript/mujs/css.c
index 3ebf552ce..343062f3b 100644
--- a/src/ecmascript/mujs/css.c
+++ b/src/ecmascript/mujs/css.c
@@ -40,6 +40,15 @@ mjs_push_CSSStyleDeclaration_item2(js_State *J, int idx)
 	js_pushstring(J, "0"); // fake
 }
 
+static void
+mjs_CSSStyleDeclaration_getPropertyValue(js_State *J)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	js_pushundefined(J); // fake
+}
+
 static void
 mjs_CSSStyleDeclaration_item(js_State *J)
 {
@@ -104,6 +113,7 @@ mjs_push_CSSStyleDeclaration(js_State *J, void *node)
 	js_newarray(J);
 	{
 		js_newuserdata(J, "CSSStyleDeclaration", node, mjs_CSSStyleDeclaration_finalizer);
+		addmethod(J, "getPropertyValue", mjs_CSSStyleDeclaration_getPropertyValue, 1);
 		addmethod(J, "item", mjs_CSSStyleDeclaration_item, 1);
 		addmethod(J, "namedItem", mjs_CSSStyleDeclaration_namedItem, 1);
 		addmethod(J, "toString", mjs_CSSStyleDeclaration_toString, 0);
diff --git a/src/ecmascript/quickjs/css.c b/src/ecmascript/quickjs/css.c
index a44c40804..46a8f0fa9 100644
--- a/src/ecmascript/quickjs/css.c
+++ b/src/ecmascript/quickjs/css.c
@@ -58,6 +58,17 @@ js_CSSStyleDeclaration_get_property_length(JSContext *ctx, JSValueConst this_val
 	return JS_NewInt32(ctx, 3); // fake
 }
 
+static JSValue
+js_CSSStyleDeclaration_getPropertyValue(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	REF_JS(this_val);
+
+	return JS_UNDEFINED;
+}
+
 static JSValue
 js_CSSStyleDeclaration_item2(JSContext *ctx, JSValueConst this_val, int idx)
 {
@@ -133,6 +144,7 @@ js_CSSStyleDeclaration_toString(JSContext *ctx, JSValueConst this_val, int argc,
 
 static const JSCFunctionListEntry js_CSSStyleDeclaration_proto_funcs[] = {
 	JS_CGETSET_DEF("length", js_CSSStyleDeclaration_get_property_length, NULL),
+	JS_CFUNC_DEF("getPropertyValue", 1, js_CSSStyleDeclaration_getPropertyValue),
 	JS_CFUNC_DEF("item", 1, js_CSSStyleDeclaration_item),
 	JS_CFUNC_DEF("namedItem", 1, js_CSSStyleDeclaration_namedItem),
 	JS_CFUNC_DEF("toString", 0, js_CSSStyleDeclaration_toString)
diff --git a/src/ecmascript/spidermonkey/css.cpp b/src/ecmascript/spidermonkey/css.cpp
index a5588df92..e7b4ab3c5 100644
--- a/src/ecmascript/spidermonkey/css.cpp
+++ b/src/ecmascript/spidermonkey/css.cpp
@@ -54,6 +54,7 @@
 
 
 static bool CSSStyleDeclaration_item(JSContext *ctx, unsigned int argc, JS::Value *rval);
+static bool CSSStyleDeclaration_getPropertyValue(JSContext *ctx, unsigned int argc, JS::Value *rval);
 static bool CSSStyleDeclaration_namedItem(JSContext *ctx, unsigned int argc, JS::Value *rval);
 static bool CSSStyleDeclaration_item2(JSContext *ctx, JS::HandleObject hobj, int index, JS::MutableHandleValue hvp);
 static bool CSSStyleDeclaration_namedItem2(JSContext *ctx, JS::HandleObject hobj, char *str, JS::MutableHandleValue hvp);
@@ -85,6 +86,7 @@ JSClass CSSStyleDeclaration_class = {
 };
 
 static const spidermonkeyFunctionSpec CSSStyleDeclaration_funcs[] = {
+	{ "getPropertyValue",	CSSStyleDeclaration_getPropertyValue,		1 },
 	{ "item",		CSSStyleDeclaration_item,		1 },
 	{ "namedItem",		CSSStyleDeclaration_namedItem,	1 },
 	{ NULL }
@@ -120,6 +122,18 @@ CSSStyleDeclaration_get_property_length(JSContext *ctx, unsigned int argc, JS::V
 	return true;
 }
 
+static bool
+CSSStyleDeclaration_getPropertyValue(JSContext *ctx, unsigned int argc, JS::Value *vp)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	JS::CallArgs args = CallArgsFromVp(argc, vp);
+	args.rval().setUndefined();
+
+	return true;
+}
+
 static bool
 CSSStyleDeclaration_item(JSContext *ctx, unsigned int argc, JS::Value *vp)
 {
@@ -138,6 +152,7 @@ CSSStyleDeclaration_item(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	return ret;
 }
 
+
 static bool
 CSSStyleDeclaration_namedItem(JSContext *ctx, unsigned int argc, JS::Value *vp)
 {