how to use nth-of-type for classes — not elements [duplicate]

Answer 1

With only CSS hacks, without modifying your markup, you can do something like the below:

[class*=' type-'], [type^='type-']{ /* Set all the divs to float: left initially */
    float: left;
    content: url('http://static.adzerk.net/Advertisers/db5df4870e4e4b6cbf42727fd434701a.jpg');
    height: 100px; width: 100px;
}

.type-2 + .type-2 + div{
    clear: both; /* Clear float for a div which follows two div with class type-2 */
}

.type-3 + .type-3 + .type-3 + div {
    clear: both; /* Clear float for a div which follows three div with class type-3 */
}

.type-4 + .type-4 + .type-4 + .type-4 + div {
    clear: both; /* /* Clear float for a div which follows four div with class type-4 */
}

Demo Fiddle