IE8 :nth-child and :before

You can (ab)use the adjacent sibling combinator (+) to achieve this with CSS that works in IE7/8.

See: http://jsfiddle.net/thirtydot/LvvNL/64/

/* equivalent to li:nth-child(1) */
#nav-primary ul li:first-child a {
    border-top: 5px solid red;
}
/* equivalent to li:nth-child(2) */
#nav-primary ul li:first-child + li a {
    border-top: 5px solid blue;
}
/* equivalent to li:nth-child(3) */
#nav-primary ul li:first-child + li + li a {
    border-top: 5px solid green;
}​

You cannot emulate more complex variations of :nth-child() such as :nth-child(odd) or :nth-child(4n+3) with this method.

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