Tables

Tables should only be used for data and not layout or design purposes. Most screen readers read web pages in the order that they display in the HTML, and tables can be very hard for screen readers to parse. The content in a table layout, while linear, doesn’t always make sense when read left-to-right and top-to-bottom. Plus, with nested tables, and various spans on the table cells can make the page difficult to figure out.

Keep it simple: Complex tables are more work for content creators as well as being harder to interpret for users. It’s usually better to break up complex tables into simple individual tables, each containing the data for one sub-topic.