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If you use tables for two-dimensional graphics you might discover a "feature" in HTML that promotes grey hair. It can affect both rows and columns, depending on the use of either rowspan or colspan. In this 7-row table three cells are assigned a rowspan of 3, but the table totals 6 rows. Where is row 4? There is a row 5-4!
In this example, the scope attribute defines what the headers describe, column or row, which screen readers use. You can add a table using HTML rather than wiki markup, as described at HTML element#Tables. However, HTML tables are discouraged because wikitables are easier to customize and maintain, as described at manual of style on tables.
Normally, copying and pasting columns or rows removes the inline CSS styling such as cell colors. There is a way to break up a table (a too-wide table for example) into more tables without losing all the background colors, and other inline styling. Copy the table to 2 sandboxes (or one sandbox, and in the article itself).
For complex layouts, rowspan and colspan may be used, but again it is sometimes simpler and more maintainable to use nested tables. Nested tables must start on a new line. In the following example, five different tables are shown nested inside the cells of a sixth, main table. None has any header cells.
An example of an HTML table containing 4 cells: Cell 1: Cell 2: ... In this case the tags colspan and/or rowspan are used - where they are set to a number.
For columns, one uses |colspan=n | content, whereas for rows, one uses |rowspan=m | content. In the table code, one must leave out the cells that are covered by such a span. The resulting column- and row-counting must fit. Tables can have cells spanning multiple rows, using |rowspan=n. The number of rows must be indicated with each use of rowspan.
Background color on rows will look off if one of the cells spans multiple rows (ex. rowspan="2"). If the table is sortable, then this gets fixed once sorted since sortable collapses row spans. If the table is sortable, then this gets fixed once sorted since sortable collapses row spans.
Here below is a fast way to link the regions and subregions in those columns. For example, after updating the whole table from the source. See example in this sandbox. The following assumes the syntax is a whole table row in one source line starting with a pipe and with double pipe between cells.