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Test Info: Warnings

<!DOCTYPE html>
<meta charset="utf-8">
<title>Masks need to cause grouping / intermediate surfaces</title>
<style>
.outer {
/* should give similar results to opacity: 0.5 */
mask: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5));
}
.box {
width: 100px;
height: 100px;
}
.one {
background: green;
}
.another {
background: blue;
margin-top: -50px;
margin-left: 50px;
}
</style>
<div class="outer">
<div class="one box"></div>
<div class="another box"></div>
</div>