LayoutTests/fast/box-shadow/inset-box-shadow.html

<style>
    div {
        position: absolute;
        top: 30px;
        left: 30px;
        border-radius: 50%;
        box-shadow: black 0px 0px 0px 2px inset;
        height: 40px;
        width: 40px;
    }
</style>
<p>You should see a black circle here</p>
<div></div>