<!DOCTYPE html>
<html>
<style>
#mask {
    position: absolute;
    left: 0px;
    top: 18px;
    background-color: #000000;
    height: 30px;
    width: 180px
}
</style>
<body>
<input type=range list=foo value="100" /><br>
<input type=range list=foo value="90" /><br>
<input type=range list=foo value="80" /><br>
<input type=range list=foo value="70" /><br>
<input type=range list=foo value="60" /><br>
<input type=range list=foo value="50" /><br>
<input type=range list=foo value="40" /><br>
<input type=range list=foo value="30" /><br>
<input type=range list=foo value="0" />
<datalist id=foo>
    <option>0</option>
    <option>30</option>
    <option>40</option>
    <option>50</option>
    <option>60</option>
    <option>70</option>
    <option>80</option>
    <option>90</option>
    <option>100</option>
</datalist>
<div id=mask></div>
</body>
</html>