rel="help" href="http://www.w3.org/TR/css3-animations/#animations">
    <link rel="match" href="css-filters-animation-grayscale-ref.html">
    <meta name="assert" content="The blue square should be half-grayscaled">
    <style type="text/css">
        @keyframes animate {
            0% {
                filter: grayscale(100%);
            }
            100% {
                filter: none;
            }
        }

        .square {
            width: 100px;
            height: 100px;
            background