Does minify CSS option merge selectors? Or is it possible by some other way using web workbench?

I've got some CSS rules that duplicate the selector but add extra rules. For example:

header {
   // size, position rules
}

And then later (or in a different file imported by SCSS):

header {
   // typograhy rules
}

I would basically want to merge the two so in the final output file I have:

header {
   // position, size
   // typography
}

I don't have the Pro version of Web Workbench so I can't see whether this is possible using the minify option. If not, is there another way of achieving this?

No, these will be minified as independent declarations. Not sure if you have already considered using mixins for this, but this would be the normal way of achieving the combining.

e.g.

@mixin layout-rules {
  // size, position fules
}

@mixin typography-rules {
  // typography
}

header
{
  @include layout-rules
  @include typography-rules
}

Jeremy