yle>
</head>
<body>

  <grid columns="8" class="debug">

    <c span="1">1</c>
    <c span="1">2</c>
    <c span="1">3</c>
    <c span="1">4</c>
    <c>5</c>
    <c>6</c>
    <c>7</c>
    <c>8</c>

    <c span="1">1</c>
    <c span="3">3</c>
    <c span="1">1</c>
    <c span="3">3</c>

    <c span="2+2">2+2</c>
    <c span="5-8">5-8</c>

    <c span="2" span-s="row">2</c>

    <c span="1..">1..</c>
    <c span="2..">2..</c>
    <c span="4..">4..</c>
    <c span="4-20">4-20</c>
    <c span="4+3">4+3</c>

   