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Blocktable allows you to embed all the blocks in a region into an HTML table. You create the table markup and place the blocks into it in any arrangement you want. You can use any table markup, such as colspan and rowspan. You can apply any styling to the table and table cells that you want. The block contents and styling are not changed.
This can useful for achieving certain layout requirements, such as arranging blocks in a multi-column format.
Blocktable has no requirements and is fairly simple to configure.