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<head>
    <title>CSS Masking: Test comma separation of rect function on clip - no comma between 3rd and 4th value</title>
    <link rel="author" title="Dirk Schulze" href="mailto:dschulze@adobe.com">
    <link rel="help" href="http://www.w3.org/TR/css-masking-1/#clip-property">
    <link rel="match" href="reference/clip-no-clipping-ref.html">
    <meta name="assert" content="Values for rect function on clip can be white
    space or comma separated, but not both. Otherwise the proper