<head>
<style>
.blockTest {
height:400px;
padding:50px;
color:white;
background-color:maroon;
-webkit-mask-box-image: url(resources/mask.png) 75 75 75 75;
}
</style>
</head>
<body>
<div class="blockTest">This content should be masked with a soft glow.</div>