Tables for any use such as page layout or data presentation present special problems to users of a screen reader. Especially if the content is in columns. Going from left to right, screen readers read across the columns, jumbling the order of the text. In addition, older browers do not support certain table formats. Tables should be used to mark up truly tabular information ("data tables") and have clearly defined headers and make sense when read from left to right. Moreover, you should avoid using tables to lay out pages ("layout tables").