CSS stylesheet support can be used for Event Delegation directly from the
stylesheet to specially prepared methods. Simple mockup:

#browser.ie4 div.contents .section:load {
  stripTables: "odd-tr";
  modifySection: 10 arg1 "argument 2";
}

In this example selector is root for delegation with event stated at the
end. Properties are methods (what would class looks like ? :: ?) and
parameters are method's parameters, separated by space.

Additionally above example contains some browsercheck, which illustrates
another usecase for such functionality.

Probably best tool for this will be CSSTidy[1] with native PHP
implementation. Other possibility is PEAR class. Own implementation is also
considered.

[1] http://csstidy.sourceforge.net/