Why might :after not work in mozille?

Question

css

Can you please tell me why this might not work in Firefox:

input.partial-check:after {
    display: block;
    content: "";
    background-color: #555;
    width: 4px;
    height: 50%;
    margin: 25% auto 0px;
}

Answer 1

For input, :before and :after do not apply.
For example: shpargalkablog.ru/2013/12/input-before-after.html
Or jQuery, actually.

Answer 2

input.partial-check set to position: relative; ?
better upload here ( jsfiddle.net ) a code snippet and throw off the link, because it's so hard to say