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chromium/third_party/blink/web_tests/external/wpt/css/css-masking/mask-image/mask-image-clip-exclude.html 

<!doctype html>
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1697311">
<link rel="author" href="" title="Ana Tudor">
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="match" href="mask-image-clip-exclude-ref.html">
<meta name="fuzzy" content="maxDifference=0-1; totalPixels=0-2000">
<title>mask-image + mask-clip + mask-composite: exclude on different background boxes</title>
<style>
div {
  display: inline-block;
  width: 100px;
  height: 100px;
  padding: 10px;
  background: linear-gradient(green, green) border-box;
  mask: linear-gradient(red, red) content-box exclude, linear-gradient(red, red);
}
</style>
<div></div>