Force IE7 & IE8 to respect :last-child

last_child.js

// Heavy-handed way to force IE7 & IE8 to respect :last-child.
// Note: Using jQuery. Adjust to suit your library, etc.
//
// Style via...
//
// element:last-child,
// element.last-child {
//   /* Style here */
// }
//
// Yes, I realize this is not performant. But IE7 & IE8
// suck. Those users are probably used to sluggishness.

function last_child() {
  if ($.browser.msie && parseInt($.browser.version, 10) <= 8) {
    $('*:last-child').addClass('last-child');
  }
}

element:last-child,
element.last-child {
    /* Style here */
}

This CSS rule will be skipped in IE7, 8.
IE 7, 8 would skip the whole rule when there are :last-child exist.

It's better to separate into two rules, ie:

element:last-child{
    /* Style here */
}
element.last-child {
    /*  and Style here */
}