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|+ Table caption adds the caption "Table caption" to the top of the table. A caption is optional, but recommended according to accessibility guidelines. |-adds a new row, which should be followed by the same number of cells found in other rows. Note, rowspan="2" and colspan="2" can be used on cells to span multiple rows and columns.
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 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.
2) The RHCP pages aren't using a table, but a chart table (de:Vorlage:Charttabelle), which looks like a table in a desktop browser, but changes in a mobile browser so that row data is displayed vertically as opposed to horizontally with the column headers listed at the top of the entire chart. In certain curcumstances, this might be a better ...
! colspan="2" {{vert header|cellstyle=background-color:gold|Your text here}} – produces a header spanning two columns, with a gold background; use no vertical bar after colspan; You can also use the ! {{verth|Your text here}} shorthand. An example below (from Help:Sortable tables) with headers that span rows or columns (using rowspan and ...
Note that a summary is not needed in most of Wikipedia's tables. The summary is useful when the table has a complex structure (for example, when there are several sets of row or column headers, or when there are multiple groups of columns or rows). The summary may also be helpful for simple data tables that contain many columns or rows of data.