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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Masking: mask-image: unresovlable mask url</title>
<link rel="author" title="CJ Ku" href="mailto:cku@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="help" href="https://www.w3.org/TR/css-masking-1/#the-mask-image">
<link rel="match" href="/css/reference/blank.html">
<meta name="assert" content="Test checks non-existent url should be counted as an image layer of transparent black.">
<style type="text/css">
div {
background-color: purple;
width: 100px;
height: 100px;
}
div.mask-by-png {
mask-image: url(non-existent.png);
}
</style>
</head>
<body>
<div class="mask-by-png"></div>
</body>
</html>
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