<style>
#bg{display:none;position:fixed;width:100%;height:100%;background:#000;z-index:2;top:0;left:0;opacity:0.7;}
</style>
<script>
function showMask() {
document.getElementById("bg").style.display ="block";
}
function hideMask() {
document.getElementById("bg").style.display ='none';
}
</script>
<body>
<div id="bg"></div>
</body>html+js+css implements occlusion layer
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