Major Description
The following spec issue does not look to be implemented in the MyFaces 2.3.0-beta: https://github.com/javaee/javaserverfaces-spec/issues/1436
The following text was added to the JSF 2.3 specification section 2.2.6 "Render Response":
If running on a container that supports Servlet 4.0 or later, after any dynamic component manipulations have been
completed, any resources that have been added to the UIViewRoot, such as scripts, images, or stylesheets, and any
inline images, must be pushed to the client using the Servlet Server Push API. All of the pushes must be started
before any of the HTML of the response is rendered to the client.