An ICSSDocument represents all the CSS code in a
.css file or within a <Style> tag in MXML.
It is the root of a tree of objects of type ICSSNode.
For example, CSS such as as
Button { color: red; font-size: 12 }
is represented by an ICSSRule which has one simple
ICSSSelector named "Button" and two
ICSSProperty objects named "color"
and "font-size".
Each ICSSProperty has an ICSSPropertyValue;
in this case they represent the two values red
and 12.
A rule can have a list of selectors, each of which can be a complex combination
of simple selectors; they are stored in a linked-list-like data structure,
where an ICSSCombinator in the link between between selectors.
Unlike AS and MXML source files, a CSS source file doesn't create a compilation unit in a project. There are three reasons for this: