I get a workarround that did the trick but I think it’s not a good practice.
First, I downloaded the the vaadin-xs source code from SVN and I compiled it. I’m not sure if this step is necessary. Then, in the div tag I call to URL with parameters and then I call to getEmbedJS.
Yes, you definitely should build it yourself. The published version is very outdated will will not work on e.g. Safari with its default settings and probably also not on next FF versions either. The project has been practically abandoned since I have moved to develop our commercial products. But the SVN version is in quite ok shape and works fine for me in one of my hobby project.
There are some plans to integrate equivalent functionality to Vaadin 7.x and discontinue the separate add-on, but it is not on the public roadmap at the moment so we cannot promise anything about it.