Pseudo-Classes vs. Pseudo-Elements

For the longest time the only pseudo selectors that we could use were :link, :hover, :visited and :active and they could only be applied to a tags. As long as we were intending to support ie6 that was all we could do. As we've adopted philosophies like progressive enhancement, graceful degradation, or dropped support for ie6, 7, and 8 we have seen the landscape of CSS selectors change dramatically.