Vaadin XS Add-on provides basic support for embedding a Vaadin application in a domain different from where the application is running. Normally, the security model in browsers would prevent this by following the same origin policy, even if the server is running in the same domain but different port. Vaadin XS works around this limitation by using JSONP-style communication instead of standard XmlHttpRequests. The add-on provides cross-site embedding for all the same browsers that are supported by the core Vaadin. Vaadin XS Add-on is provided as a Zip package. Download and extract the installation package to a local folder. Instructions for installation is given in the README.html file in the package.