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Merged cells

WCAG 1.3.1 Level A In WCAG 2.0 and later

Why it matters

Merged cells make tables hard to follow with a screen reader, because rows and columns no longer line up.

How to fix it

Unmerge the cells and repeat the label in each cell, or split the table into simpler tables.

Read the W3C's explanation (WCAG 1.3.1)