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WCAG: Best Practice: The <caption> element should not contain the same text as the summary attribute
Data table markup can be tedious and confusing. Make sure the caption and summary table attributes are not identical. Screen readers have some features to manage table navigation, but tables must be marked up accurately for these features to work correctly.
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.
When tables have summary and caption text that is identical, screen reader users can be confused and find it difficult to know the name and purpose of the table.