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Note, rowspan="2" and colspan="2" can be used on cells to span multiple rows and columns. Header cells are created with ! Header cell, which can be column or row headers. Data cells are created with | Data cell. A new column can be added by adding another cell to the first row.
Note that using rowspan=2 for cell G combined with rowspan=3 for cell F to get another row below G and F won't work, because all (implicit) cells would be empty. Below is the same table with the order of the declared rows and cells shown in parentheses. The uses of rowspan and colspan are also shown.
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 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!
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.
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
This clearly identifies a cell as a header for a column or row. Use ! scope="colgroup" colspan="2" | if a column header spans a group of columns and ! scope="rowgroup" rowspan="2" | if a row header spans a group of rows, adjusting the span count as needed. Headers can now be associated to corresponding cells.
Old screen readers, text-to-speech systems and text browsers like Lynx do not support rowspan and colspan. The result can be very confusing for users of these technologies. The result can be very confusing for users of these technologies.