mshtml: Added IHTMLScreen::get_colorDepth implementation.

dlls/mshtml/htmlscreen.c

@@ -127,8 +127,11 @@ static HRESULT WINAPI HTMLScreen_Invoke(IHTMLScreen *iface, DISPID dispIdMember,
 static HRESULT WINAPI HTMLScreen_get_colorDepth(IHTMLScreen *iface, LONG *p)
 {
     HTMLScreen *This = HTMLSCREEN_THIS(iface);
-    FIXME("(%p)->(%p)\n", This, p);
-    return E_NOTIMPL;
+
+    TRACE("(%p)->(%p)\n", This, p);
+
+    *p = GetDeviceCaps(get_display_dc(), BITSPIXEL);
+    return S_OK;
 }
 
 static HRESULT WINAPI HTMLScreen_put_bufferDepth(IHTMLScreen *iface, LONG v)

dlls/mshtml/tests/dom.c

@@ -3069,6 +3069,12 @@ static void test_screen(IHTMLWindow2 *window)
     ok(hres == S_OK, "get_height failed: %08x\n", hres);
     ok(l == exl, "height = %d, expected %d\n", l, exl);
 
+    exl = GetDeviceCaps(hdc, BITSPIXEL);
+    l = 0xdeadbeef;
+    hres = IHTMLScreen_get_colorDepth(screen, &l);
+    ok(hres == S_OK, "get_height failed: %08x\n", hres);
+    ok(l == exl, "height = %d, expected %d\n", l, exl);
+
     DeleteObject(hdc);
 
     IHTMLScreen_Release(screen);