Webmastertoolbag Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style>
.masked {
  background: green;
  border: 30px solid blue;
  padding: 20px;
  -webkit-mask-image: url(/cssref/img_circle.svg);
  mask-image: url(/cssref/img_circle.svg);
  mask-size: 50%;
  mask-repeat: no-repeat;    
}

.mask1 {
  mask-origin: border-box;  
}

.mask2 {
  mask-origin: content-box;  
}

.mask3 {
  mask-origin: padding-box;  
}

.mask4 {
  mask-origin: fill-box;  
}
</style>
</head>
<body>

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

<h3>Set mask-origin: border-box:</h3>
<div class="masked mask1">
  
</div>

<h3>Set mask-origin: content-box:</h3>
<div class="masked mask2">
  
</div>

<h3>Set mask-origin: padding-box:</h3>
<div class="masked mask3">
  
</div>

<h3>Set mask-origin: fill-box:</h3>
<div class="masked mask4">
  
</div>

<h3>Original image:</h3>