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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.
The wikitext must be correct. An incorrect rowspan organization can break sorting, cause weird table formatting, move data to the wrong column, etc. See examples below. When sorted all the rows are filled. Tables without rowspan are much easier to maintain by less experienced editors, and by editors who are stopping by only once to edit the table.
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 the code, the cell | colspan="2" | A spans two columns. Note that, in the next column, a cell expected to contain "B" does not exist. Similar: in the code, cell | rowspan="2" | BBB spans two rows. A cell expected to contain "BBBB" does not exist.
The first uses colspan="2" <-- This row has three table data cells, but one spans two rows because it uses rowspan="2" <-- This row has only two table data cells, because its first is being taken up
The key principle in their design and implementation is to maintain normal flow, i.e. to ensure that the ordering of the content in the page code matches the order in which the content is to be presented. This also applies to other coding approaches, such as divs with CSS styling, or rowspan and colspan HTML cell attributes.
If the header cells have other attributes, for example, colspan or rowspan, there must be no vertical bar | between the attributes and the template call. If your browser does not support CSS property writing-mode: vertical-rl that makes this template possible, it gracefully degrades to the default display of the table columns.
This is the same as the maximum number of linearly independent rows that can be chosen from the matrix, or equivalently the number of pivots. For example, the 3 × 3 matrix in the example above has rank two. [9] The rank of a matrix is also equal to the dimension of the column space.