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chromium/third_party/blink/web_tests/external/wpt/css/css-images/image-set/image-set-all-options-invalid.html 

<!doctype html>
<title>image-set() is an invalid image if all options are invalid</title>
<link rel="help" href="https://drafts.csswg.org/css-images-4/#image-set-notation">
<link rel="help" href="https://drafts.csswg.org/css-images-4/#invalid-image">
<link rel="help" href="https://www.w3.org/TR/css-backgrounds-3/#border-image-source">
<link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
<style>
  #target {
      width: 100px;
      height: 100px;
      box-sizing: border-box;
      background-color: red;
      border: 50px solid green;
      border-image: 1 / 10px image-set(url('data:image/png;base64,') type('image/unknown'));
  }
</style>
<p>Test passes if there is a filled green square.</p>
<div id="target"></div>