How to style unordered lists in CSS as comma separated text

Question

I’m looking for a way to style an unordered list in XHTML with CSS such that it is rendered inline and the list items are separated by commas.

For example, the follo

Answer 1

It's easy with CSS3 you can use pseudo selector last-child and not at once:

ul#taglist li:not(:last-child):after {
    content: ", ";
}

Check results here https://jsfiddle.net/vpd4bnq1/