table-layout:auto;
thead 1
thead 2
thead 3
th 1
td 1
td 2
td 3
th 2
td 5
td 6
td 7
th 3
td 9
td 10
td 11
table-layout:fixed;
thead 1
thead 2
thead 3
th 1
td 1
td 2
td 3
th 2
td 5
td 6
td 7
th 3
td 9
td 10
td 11