@smallcircles If you control both ends of the pipeline, you don’t need any validation or interoperability. XML technologies are thus not needed anymore. The price you pay as a developer is a more and more heavy dependency on a HTML5-compliant web browser. The web as a whole pays an additional cost that the developer becomes the little tyrant of their corner of the web, and the browser ecosystem is collapsing into a monopoly. We can’t build anything useful on top of that.