Why CSS class is made such that it can't contain another CSS class
Why one CSS class can't contain another CSS class
e.g.
    
    .parentCSS width:100% childCSS

I really have many duplicate entries in my file because of this 

Somewhere on the aspx page (on control many css classes) and somewhere in the css file (on css class many duplicate attributes).

Any suggession how to write proper css if css nesting is unachievable.
Why CSS class is made such that it can't contain another CSS class
===

Why one CSS class can't contain another CSS class
e.g.
    
    .parentCSS width:100% childCSS

I really have many duplicate entries in my file because of this 

Somewhere on the aspx page (on control many css classes) and somewhere in the css file (on css class many duplicate attributes).

Any suggession how to write proper css if css nesting is unachievable.