Screen readers have some quirks and odd behaviours, and one that is quite hard to understand is how JAWS determines whether a table is a layout or data table. From Jared Smith’s JAWS ate my tables:

However, JAWS does not consider table headers or any other markup commonly used in data tables to determine the table type.

Instead, JAWS assumes the presence of a data table if it has at least 2 rows and 2 columns AND at least 4 cells in the table are between 200 and 16000 square pixels in size.

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