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Nesting tables within tables lets you create some complex effects from just basic HTML table tags. Nesting tables places one table inside of another. To nest a table, start the table as you normally would. When you come to the cell into which you want to place the nested table, enter the table data tag. Then, instead of typing the contents of the cell as you normally would, start the nested table. The table becomes that cell's content. After you end the nested table, be sure to end the table cell it is in with the <,/td> tag.
This table was built by nesting tables inside one another. We'll be the first to tell you it isn't a terribly attractive table, but it shows how you can place tables within tables.