<!DOCTYPE html>
<html>
<head>
<style>
.mask {
    -webkit-mask-box-image: url('resources/mask.png') 0;
    background-color: black;
    width: 11px;
    height: 11px;
}
</style>
</head>
<body>
<p>This should be a single black dot.</p>
<div class="mask"></div>
</body>
</html>
