html 自动换行 合并边线

<style>
body { margin:8px;}
table {
    margin: 8px auto;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    font-weight: normal;
    border: 1px solid #000000;
    border-collapse: collapse;
    table-layout: fixed;
}
td {
    border: 1px solid #000000;
    padding: 3px 3px 3px 3px;
    word-wrap:break-word;
}
</style>