each data cell so a user can understand the complex relationship of the tabular data.

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### What to do

 * If this is not a data table, use CSS instead of a `<table>` element to lay out your content (highly recommended)
 * **Or**, identify the table as layout with `role="presentation"` or `role="none"`
 * **Or**, if this is a simple data table, use the `<th>` element to identify headers in the first row
 * **Or**, if this is a c