diff --git a/dlls/mshtml/dispex.c b/dlls/mshtml/dispex.c
index c42e2ef1864..66dad69fb5d 100644
--- a/dlls/mshtml/dispex.c
+++ b/dlls/mshtml/dispex.c
@@ -480,6 +480,19 @@ HRESULT dispex_get_dprop_ref(DispatchEx *This, const WCHAR *name, BOOL alloc, VA
     return S_OK;
 }
 
+HRESULT dispex_get_dynid(DispatchEx *This, const WCHAR *name, DISPID *id)
+{
+    dynamic_prop_t *prop;
+    HRESULT hres;
+
+    hres = get_dynamic_prop(This, name, fdexNameEnsure, &prop);
+    if(FAILED(hres))
+        return hres;
+
+    *id = DISPID_DYNPROP_0 + (prop - This->dynamic_data->props);
+    return S_OK;
+}
+
 static HRESULT dispex_value(DispatchEx *This, LCID lcid, WORD flags, DISPPARAMS *params,
         VARIANT *res, EXCEPINFO *ei, IServiceProvider *caller)
 {
diff --git a/dlls/mshtml/htmlwindow.c b/dlls/mshtml/htmlwindow.c
index 9069e6d8cae..3ee2273fc67 100644
--- a/dlls/mshtml/htmlwindow.c
+++ b/dlls/mshtml/htmlwindow.c
@@ -2461,21 +2461,40 @@ static HRESULT HTMLWindow_invoke(DispatchEx *dispex, DISPID id, LCID lcid, WORD
         IDispatch_Release(disp);
         break;
     }
-    case GLOBAL_ELEMENTVAR: {
-        IHTMLElement *elem;
+    case GLOBAL_ELEMENTVAR:
+        switch(flags) {
+        case DISPATCH_PROPERTYGET: {
+            IHTMLElement *elem;
 
-        hres = IHTMLDocument3_getElementById(&This->doc->basedoc.IHTMLDocument3_iface,
-                                             prop->name, &elem);
-        if(FAILED(hres))
-            return hres;
+            hres = IHTMLDocument3_getElementById(&This->doc->basedoc.IHTMLDocument3_iface,
+                    prop->name, &elem);
+            if(FAILED(hres))
+                return hres;
 
-        if(!elem)
-            return DISP_E_MEMBERNOTFOUND;
+            if(!elem)
+                return DISP_E_MEMBERNOTFOUND;
 
-        V_VT(res) = VT_DISPATCH;
-        V_DISPATCH(res) = (IDispatch*)elem;
-        break;
-    }
+            V_VT(res) = VT_DISPATCH;
+            V_DISPATCH(res) = (IDispatch*)elem;
+            return S_OK;
+        }
+        case DISPATCH_PROPERTYPUT: {
+            DISPID dispex_id;
+
+            hres = dispex_get_dynid(&This->dispex, prop->name, &dispex_id);
+            if(FAILED(hres))
+                return hres;
+
+            prop->type = GLOBAL_DISPEXVAR;
+            prop->id = dispex_id;
+            return IDispatchEx_InvokeEx(&This->dispex.IDispatchEx_iface, dispex_id, 0, flags, params, res, ei, caller);
+        }
+        default:
+            FIXME("Not suppoted flags: %x\n", flags);
+            return E_NOTIMPL;
+        }
+    case GLOBAL_DISPEXVAR:
+        return IDispatchEx_InvokeEx(&This->dispex.IDispatchEx_iface, prop->id, 0, flags, params, res, ei, caller);
     default:
         ERR("invalid type %d\n", prop->type);
         hres = DISP_E_MEMBERNOTFOUND;
diff --git a/dlls/mshtml/mshtml_private.h b/dlls/mshtml/mshtml_private.h
index c8551fb6175..3376084d807 100644
--- a/dlls/mshtml/mshtml_private.h
+++ b/dlls/mshtml/mshtml_private.h
@@ -229,6 +229,7 @@ BOOL dispex_query_interface(DispatchEx*,REFIID,void**) DECLSPEC_HIDDEN;
 HRESULT dispex_get_dprop_ref(DispatchEx*,const WCHAR*,BOOL,VARIANT**) DECLSPEC_HIDDEN;
 HRESULT get_dispids(tid_t,DWORD*,DISPID**) DECLSPEC_HIDDEN;
 HRESULT remove_prop(DispatchEx*,BSTR,VARIANT_BOOL*) DECLSPEC_HIDDEN;
+HRESULT dispex_get_dynid(DispatchEx*,const WCHAR*,DISPID*) DECLSPEC_HIDDEN;
 void release_typelib(void) DECLSPEC_HIDDEN;
 HRESULT get_htmldoc_classinfo(ITypeInfo **typeinfo) DECLSPEC_HIDDEN;
 
@@ -248,7 +249,8 @@ typedef struct ScriptHost ScriptHost;
 
 typedef enum {
     GLOBAL_SCRIPTVAR,
-    GLOBAL_ELEMENTVAR
+    GLOBAL_ELEMENTVAR,
+    GLOBAL_DISPEXVAR
 } global_prop_type_t;
 
 typedef struct {
diff --git a/dlls/mshtml/tests/jstest.html b/dlls/mshtml/tests/jstest.html
index abda45e73f6..10863f49f6e 100644
--- a/dlls/mshtml/tests/jstest.html
+++ b/dlls/mshtml/tests/jstest.html
@@ -60,6 +60,14 @@ function test_document_name_as_index() {
     var e = document.getElementById("formid");
     ok(!!e, "e is null");
     ok(!("formid" in document), "formid is in document");
+
+    document.body.innerHTML = '<form name="formname"></form>';
+    ok("formname" in window, "formname' is not in window");
+    ok(typeof(window.formname) === "object", "typeof(window.formname) = " + typeof(window.formname));
+    window.formname = 1;
+    ok(window.formname === 1, "window.formname = " + window.formname);
+    formname = 2;
+    ok(window.formname === 2, "window.formname = " + window.formname);
 }
 
 function test_remove_style_attribute() {