All <th> elements and elements with role=columnheader/rowheader must have data cells they describe
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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
Ensure that each table header in a data table refers to data cells so that each header cell that is used is actually a header of something.
- HTML 4