Licensed to the Apache Software Foundation (ASF) under one or more contributor 
license agreements; and to You under the Apache License, Version 2.0.

Css modules list (source http://www.css3.info/modules/)

* Selectors 
* CSS Color 

* CSS Namespaces 
* CSS Backgrounds & Borders 
* CSS Multi-column Layout
(*) Media Queries 
* CSS Marquee 
* CSS Ruby 
* CSS Basic User Interface 
* CSS Style Attributes 

* CSS Paged Media 

* CSS Values & Units 
* CSS Cascading & Inheritance 
* CSS Text 
* CSS Writing Modes 
* CSS Generated Content for Paged Media 
* CSS Fonts 
* CSS Basic Box Model 
x CSS Template Layout 
* CSS Speech 
* CSS Grid Positioning 
* CSS Flexible Box Layout 
* CSS Image Values & Replaced Content 
* CSS 2D Transformations 
* CSS 3D Transformations 
* CSS Transitions 
* CSS Animations 
* CSSOM View 
x CSS Syntax 
* CSS Lists and Counters
x CSS Reader Media Type 
CSS Generated & Replaced Content
* CSS Line Layout 
* CSS Hyperlink Presentation 
* CSS Presentation Levels 


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general:
- css module should be able to provide new unit acceptors
- support for functions providing + completion, checking?
- inherit property support (parsing, error checking, completion, ...)
- support for extending property grammar definition by other module/s (merging)
- characters escaping in grammar definition (like '[' or '*' chars), see GridPositioningModuleTest
    -uncomment #display=flexbox | inline-flexbox then
- context aware properties - works only in some context of the css file


selectors module:
--------------------

completion of pseudo elements on pseudo classes:
    *:target::before { content : url(target.png) }


values and units module:
-------------------------
- functions