Re: Parent Combinator / Parent pseudo-class

Francois Remy wrote:
> You don't need to run the whole selector each time there's a DOM 
> modification, only each one that are applying on elements that are 
> concerned by the rule.

This becomes an issue of determining whether any rules might be 
"concerned by" a given element.  This process itself is either slow or 
inexact (and in the latter case, you rerun the matching on a too-big 
part of the DOM).

-Boris