exceptions/conditions in classes

How can you make conditions in classes?

tr.list_row2:hover > td > div {
/* proporties */
}

How can you make an exception for tr.list_row2:hover > td > div.test? The class doesn't have to be added if the element has t开发者_如何转开发he class div.test

Use CSS3's :not():

tr.list_row2:hover > td > div:not(.test) {
}

or for old IEs which don't recognize it,

tr.list_row2:hover > td > div {
}

tr.list_row2:hover > td > div.test {
    /* undo above rules */
}