All I know is that I see regularly regressions when devs touch the CSS and one 
reason I believe is because CSS files are not commented so you don't know why 
something was done in a given way and you change it, thus breaking some other 
part.

I have touched the CSS several times too and I know I was very uncomfortable 
every time since I didn't know where what I was touching was used and what were 
the rules governing what I was touching.

Maybe there are ways to write unit tests for CSS and if that existed it would 
be even better than commenting I agree (even though comments would still be 
needed to explain why something is done in given manner).

Thanks
-Vincent

On Jan 21, 2010, at 8:36 PM, Ecaterina Valica wrote:

> If we want to have more comments in the CSS we should use a minimizer for
> the CSS, so that they are removed (along with the spaces) from the version
> we serve to the client. Some CSS files we have already do this.
> 
> Another problem with CSS is that we add / modify some rules to assure
> compatibility with some specific browser. A solution would be to have
> specific files (just like the one we have for IE6) for the browsers that
> need those properties, so that we don't have to comment on every lines what
> compatibility is used for. Having multiple files that do the same thing can
> be hard to manage and sometimes browsers share behavior (depending on the
> engine). Ex: In the patch above the scrolling was only for Chrome and
> Safari.
> 
> And the big problem in my opinion is that rules come in packages. To fix one
> bug you would need to comment a line in a class that is dependent to a line
> from another class, etc, etc. Ex: In the patch above the widths matter
> because of the float:left. Plus the cascading inheritance behavior of CSS.
> 
> Right now we use comments in CSS to group properties, to specify overriding,
> to specify the browser that needs the property or to mark the hack.
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