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For table markup, it can be applied to whole tables, table captions, table rows, and individual cells. CSS specificity in relation to content should be considered since applying it to a row could affect all that row's cells and applying it to a table could affect all the table's cells and caption, where styles closer to the content can override ...
More template styles for tables: {{sticky header}} - Makes column headers stick to the top of the page while scrolling through table data. {} - moves the sorting arrows under the headers. {{row hover highlight}} - adds row hover highlighting, and option for white background. {{static row numbers}} - adds a column of row numbers to a table.
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!
Do not place column headers in the middle of a table to visually separate the table. For example, a screen reader reading the cell "Stuttgart, Germany" might associate the cell with the following headers: "Venue, Representing Soviet Union, Representing Belarus". Three headers are read aloud. The first and the third are correct and expected.
The caption for the first table has <br /> tags as a small hack to nudge all three tables to have equally high (in line numbers) captions, for the appearance of tidiness. The three tables I have placed in columns (assuming a wide enough display) using {{Columns-start}}, which should responsively collapse for narrower displays (like phones).
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.
Consecutive rows of column headers are top sticky, so avoid adding a row of headers right under the column headers that don't apply to the entire table such as a section header meant to visually separate the table. A solution might be to move each section to a column or separate tables, which also avoids accessibility issues per MOS:COLHEAD.