<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">
<html>

<head>
    <title>圣诞树</title>
    <meta charset="utf-8">
    <style>
        html,
        body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            border: 0;
            zoom: 1.3;
        }

        canvas {
            display: block;
            margin: 20px auto;
        }

        div {
            margin: 0;
            padding: 0;
            border: 0;
        }

        .nav {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 27px;
            background-color: white;
            color: black;
            text-align: center;
            line-height: 25px;
        }

        a {
            color: black;
            text-decoration: none;
            border-bottom: 1px dashed black;
        }

        a:hover {
            border-bottom: 1px solid red;
        }

        .previous {
            float: left;
            margin-left: 10px;
        }

        .next {
            float: right;
            margin-right: 10px;
        }

        .green {
            color: green;
        }

        .red {
            color: red;
        }

        textarea {
            width: 100%;
            height: 100%;
            border: 0;
            padding: 0;
            margin: 0;
            padding-bottom: 20px;
        }

        .block-outer {
            float: left;
            width: 22%;
            height: 100%;
            padding: 5px;
            border-left: 1px solid black;
            margin: 30px 3px 3px 3px;
        }

        .block-inner {
            height: 68%;
        }

        .one {
            border: 0;
        }
    </style>
</head>

<body marginwidth="0" marginheight="0">
    <canvas id="c" height="356" width="446">
        <script>
            var collapsed = true;

            function toggle() {
                var fs = top.document.getElementsByTagName('frameset')[0];
                var f = fs.getElementsByTagName('frame');
                if (collapsed) {
                    fs.rows = '250px,*';
                    // enable resizing of frames in firefox/opera
                    fs.noResize = false;
                    f[0].noResize = false;
                    f[1].noResize = false;
                } else {
                    fs.rows = '30px,*';
                    // disable resizing of frames in firefox/opera
                    fs.noResize = true;
                    f[0].noResize = true;
                    f[1].noResize = true;
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                collapsed = !collapsed;
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        <script>
            var b = document.body;
            var c = document.getElementsByTagName('canvas')[0];
            var a = c.getContext('2d');
            document.body.clientWidth; // fix bug in chrome.
        </script>
        <script>
            // start of submission //
            M = Math;
            Q = M.random;
            J = [];
            U = 16;
            T = M.sin;
            E = M.sqrt;
            for (O = k = 0; x = z = j = i = k < 200;) with(M[k] = k ? c.cloneNode(0) : c) {
                width = height = k ? 32 : W = 446;
                with(getContext('2d')) if (k > 10 | !k)
                        for (font = '60px Impact', V = 'rgba('; I = i * U, fillStyle = k ? k == 13 ? V +
                            '205,205,215,.15)' : V + (147 + I) + ',' + (k % 2 ? 128 + I : 0) + ',' + I + ',.5)' :
                            '#cca', i < 7;) beginPath(fill(arc(U - i / 3, 24 - i / 2, k == 13 ? 4 - (i++) / 2 : 8 -
                            i++, 0, M.PI * 2, 1)));
                    else
                        for (; x = T(i), y = Q() * 2 - 1, D = x * x + y * y, B = E(D - x / .9 - 1.5 * y + 1), R =
                            67 * (B + 1) * (L = k / 9 + .8) >> 1, i++ < W;)
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                                U + x * 8, U + y * 8), lineTo(U + x * U, U + y * U), stroke();
                for (y = H = k + E(k++) * 25, R = Q() * W; P = 3, j < H;) J[O++] = [x += T(R) * P + Q() * 6 - 3,
                    y += Q() * U - 8, z += T(R - 11) * P + Q() * 6 - 3, j / H * 20 + ((j += U) > H & Q() > .8 ?
                        Q(P = 9) * 4 : 0) >> 1
                ]
            }
            setInterval(function G(m, l) {
                A = T(D - 11);
                if (l) return (m[2] - l[2]) * A + (l[0] - m[0]) * T(D);
                a.clearRect(0, 0, W, W);
                J.sort(G)
                for (i = 0; L = J[i++]; a.drawImage(M[L[3] + 1], 207 + L[0] * A + L[2] * T(D) >> 0, L[1] >>
                        1)) {
                    if (i == 2e3) {
                        var style =  a.createLinearGradient(0,0,400,0);
                        style.addColorStop(0,"blue");
                        style.addColorStop(1,"red");
                        a.fillStyle=style;
                        a.fillText('Merry Christmas!', U, 400);
                    }
                    if (!(i % 7)) a.drawImage(M[13], ((157 * (i * i) + T(D * 5 + i * i) * 5) % W) >> 0, ((113 *
                        i + (D * i) / 60) % (290 + i / 99)) >> 0);
                }
                D += .02
            }, 1)
            // end of submission //
        </script>
</body>

</html>
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