Arbitrary XML Rendering ( AXR ), is a defunct project whose aim is to create a better standard for creating web page and web applications . It will use XML for the content and HSS for the presentation layer. Some JavaScript will be used as well.


The founder of the project, Miro Keller, started with the design of HSS in early 2009, because of his frustration with the limitations of CSS . Initially it would be a strict superset of CSS, but it was developed, it became clear that no backwards compatibility could be maintained.

It started out as a simple text document defining the specification of an imaginary layout language, but the initial idea was developed in a real community, with a clear goal: make the lives of web designers and developers easier.

Currently, HSS itself is a prototype of the rendering engine.