a11yTips — Use scope attributes to associate cells in complex…

Use scope attributes to associate cells in complex data tables

Make sure data cells in complex tables are explicitly associated using the scope attribute

Complex data tables are tables that have more than one level of headers, whether these headers are assigned to columns or rows. Such tables are more difficult to understand for someone who is visually impaired, especially when some of the cells happen to be merged. Consequently, assistive technologies will require additional semantics to properly convey the relationship between different cells back to users.

To do so, simply clarify the scope of any cell used as a header by assigning [...]

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