Some IE related hacks can not be used from IE 8b2.
For this reason, we fixed some items (marked with * in the modified items).
However, since I confirmed with IETester (IE8b2), there is no guarantee that it will be applied even in the current RC version. Please think that it is provisional to the last. I confirmed that it will work with the product version of IE8.
In addition, Opera judged that there is not much meaning corresponding to the old version and put it together.
There were four for Firefox, but I left one and deleted the others.
CSS hack is not a very good way to do it. Do not use it indiscriminately, let’s keep it to the minimum necessary. If you do not use it you never have done it.