input[type="range"] {
    position: relative;
    margin-left: 1em;
}
input[type="range"]:after,
input[type="range"]:before {
    position: absolute;
    top: 1em;
    color: #aaa;
}
input[type="range"]:before {
    left:0em;
    content: attr(min);
}
input[type="range"]:after {
    right: 0em;
    content: attr(max);
}