[Thasaidon]

I apologise I think I have misled some people as to what I was asking. I should have KISS'ed it (Keep It Simple Stupid)

Simply put, a CSS nay contain the following rules

.chapterHeader {
height: 60px;
border: 1px solid #000;
display: block;
margin-bottom: 20px;
background-color: #FFF
}

.chaprHd {
height: 60px;
border: 1px solid #000;
display: block;
margin-bottom: 20px;
background-color: #FFF
}

I expected Merge Identical CSS Rules to change this to something like

.chaprHd, chapterHeader {
height: 60px;
border: 1px solid #000;
display: block;
margin-bottom: 20px;
background-color: #FFF
}

i.e. To produce a stacked rule and delete the two original rules

From a very hazy memory of when this feature was introduced this is what I thought it did,

If I understand Kovid's answer to my rambling question , correctly, the answer is NO. It does not work like that.

If that is the case would a plugin or Regex guru would like to help.

The reason I would find this useful is in the bBook, I mentioned. It had over 1000 lines in the CSS, all used, which included duplicated rule sets, each having a unique Selector name.

Reducing clutter by having a smaller number of rule sets with stacked Selectors would be easier to follow.

I hope this clears up any confusion I causedr