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<!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>