All non-empty td elements in a table larger than 3 by 3 must have an associated table header
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Data table markup can be tedious and confusing. It is important that it is done semantically and with the correct header structure. Screen readers have a number of features to make table navigation easier, but tables must be marked up accurately for these features to work properly.
The Algorithm, in Simple Terms
Why this is Important
Screen readers have a specific way of announcing tables. When tables are not properly marked up, this creates the opportunity for confusing or inaccurate screen reader output.
How to Fix the Problem
To fix the problem, ensure that each non-empty data cell in a large table has one or more table headers. All table data cells (
<td>) must have a table header to ensure screen reader users can make sense of tabular data.
Note: A table is considered large if it is 3 or more cells wide and 3 or more cells high.
- HTML 4