<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>CSS Masking: mask-image: mask layer image</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="mask-image-1-ref.html">
    <meta name="assert" content="Test checks whether treat unresolvable mask as no-mask for a SVG element embedded in HTML document.">
  </head>
  <body>
    <svg width="100" height="100">
      <rect x="0" y="0" width="100" height="50" fill="purple" mask="url(#foo)"/>
    </svg>
  </body>
</html>