Negation Pseudo-class Hack
Internet Explorer 8 and below do not support the CSS3 :not negation pseudo-class. Internet Explorer 9 added support for CSS3 pseudo-classes including the negation pseudo-class.
The negation pseudo-class accepts any simple selector: A type selector, universal selector, attribute selector, class selector, ID selector, or pseudo-class. (excluding pseudo-elements and the negation pseudo-class itself). It then applies the following properties to all elements which do not match this argument. Note that the ie8andbelow selector has no meaning, it is simply a string that will never match an actual selector. The string dummy would work equally as well.
A variation of this hack uses the :root pseudo-class, which is also unrecognized by Internet Explorer 8 and below.
Read more about this topic: CSS Filter
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