r66408 [1] added a .windowedPlugin property to TestNetscapePlugIn that calls through to NPN_SetValue(NPPVpluginWindowBool). But this is ineffective on Windows, where a plugin's windowed status can only be set within NPP_New. We should replace .windowedPlugin with an attribute on the <embed> element that TestNetscapePlugIn can look at in NPP_New. 1. http://trac.webkit.org/changeset/66408