mask-image-ref.html

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<!DOCTYPE html>

<title>CSS Reference: mask-image</title>

<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">

<link rel="author" title="Mozilla" href="https://www.mozilla.org">

<style>

#ref {

  position: absolute;

  width: 200px;

  height: 200px;

  background: green;

</style>

<p>The test passes if there is a green square and no red below.</p>

<div id="ref"></div>