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    <title>CSS Masking: mask-composite: compose vector 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="http://www.w3.org/TR/css-masking-1/#the-mask-composite">
    <link rel="match" href="mask-composite-1-ref.html">
    <meta name="assert" content="Test checks that whether mask-composite is filled automatically accordin