Answer by Vitalii Fedorenko for Set cellpadding and cellspacing in CSS?

This hack works for Internet Explorer 6 and later, Google Chrome, Firefox, and Opera:

table {
    border-collapse: separate;
    border-spacing: 10px; /* cellspacing */
    *border-collapse: expression('separate', cellSpacing = '10px');
}

table td, table th {
    padding: 10px; /* cellpadding */
}

The * declaration is for Internet Explorer 6 and 7, and other browsers will properly ignore it.

expression('separate', cellSpacing = '10px') returns 'separate', but both statements are run, as in JavaScript you can pass more arguments than expected and all of them will be evaluated.