Dynamic content Web pages shall update equivalents when the dynamic content changes. This also applies to sites using frames . Server-side image maps Redundant text links shall be provided for each active region. Most sites have moved away from server-side image maps. The exception is for such things as geographical information system clickable maps .
Data tables Provide information of row and column headers .
Using row and column headers becomes crucial when a table is larger than two columns or two rows. Without the headers, assistive technology such as reader software can only recite the table contents with no reference to what that column or row pertains to. Multi-logic row or column headers Provide markup to associate data cells and header cells for data tables . Frames Must be titled with text that facilitates identification and navigation. Frames present unique obstacles to users of reader software.