Webmastertoolbag Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style>
.masked {
  width: 200px;
  height: 200px;
  mask-repeat: no-repeat;
  mask-size: 100%;
  background: blue;
  -webkit-mask-image: url(/cssref/img_rectangle.svg), radial-gradient(transparent 50%, black);  
  mask-image: url(/cssref/img_rectangle.svg), radial-gradient(transparent 50%, black);
}

.mask1 {
  mask-composite: add;
}

.mask2 {
  mask-composite: subtract;
}

.mask3 {
  mask-composite: intersect;
}

.mask4 {
  mask-composite: exclude;
}
</style>
</head>
<body>

<h1>The mask-composite Property</h1>

<h3>mask-composite: add;</h3>
<div class="masked mask1"></div>

<h3>mask-composite: subtract;</h3>
<div class="masked mask2"></div>

<h3>mask-composite: intersect;</h3>
<div class="masked mask3"></div>

<h3>mask-composite: exclude:</h3>
<div class="masked mask4"></div>