My first answer didn't attempt to fix both headers and columns. Here's an example that should work in all typical browsers (but it may need some tweaking).
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| A1 | B1 | C1 | D1 | E1 | F1 |
| A2 | B2 | C2 | D2 | E2 | F2 |
| A3 | B3 | C3 | D3 | E3 | F3 |
| A4 | B4 | C4 | D4 | E4 | F4 |
| A5 | B5 | C5 | D5 | E5 | F5 |
| A6 | B6 | C6 | D6 | E6 | F6 |
| A7 | B7 | C7 | D7 | E7 | F7 |
| A8 | B8 | C8 | D8 | E8 | F8 |
| A9 | B9 | C9 | D9 | E9 | F9 |
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