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    <meta charset="utf-8">
    <title>CSS Masking: mask-size: mask layer size</title>
    <link rel="author" title="Astley Chen" href="mailto:aschen@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-size">
    <link rel="match" href="mask-size-auto-ref.html">
    <meta name="assert" content="Test checks whether sizing mask layer works correctly or not.">
    <style type