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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.
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!
Example: If merging non-similar cells is essential, while not ideal, a work-around is to create a hidden column. This column can be given an appropriate heading name, that will not appear to sighted readers but will be recognized and read by screen readers. The following example is a snippet of a table from List of chronometers on HMS Beagle.
-- This module implements {{Series overview}}. require ('strict') local yesno = require ('Module:Yesno') local HTMLcolor = mw. loadData ('Module:Color contrast/colors')----- SeriesOverview class-- The main class.-----local SeriesOverview = {} function SeriesOverview. cellspan (SeasonEntries, SeasonEntries_ordered, key, cell, multipart, setspan) if setspan ~= nil then return setspan end local ...