Tables used for layout purposes shouldn't include data elements:
<caption> element or
How this Lighthouse audit fails
Lighthouse flags layout
<table> elements that use
The Lighthouse Accessibility score is a weighted average of all the accessibility audits. See the Lighthouse accessibility scoring post for more information.
How to make presentational tables accessible
It's simple to pass the Lighthouse audit:
remove data elements (
<caption> elements or the
summary attribute) from layout tables.
If using a table just for visual layout, and not for tabular data, the better fix is to remove the table all together, and use cascading style sheets (CSS) to control layout instead.