If you use frames, give each separate frame a title. Make your page accessible to users who do not have programmatic objects enabled. Provide a textual description of a multimedia presentation. If making your web site accessible is not possible, provide a link to a text version of your site. Many of the above guidelines concern the use of screen readers used by visually impaired people.
Screen readers are incapable of understanding images, sound files or color.
Because screen readers move from left to right across the screen, from top to bottom, table cells intended to be read column by column rather than row by row are not recommended. When used, they must be accompanied by explanations of content and intended viewing order. Describing images and tables is not difficult. It behooves web designers to make as many accommodations as possible while they are developing web sites.