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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="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>