If an edit box, for example, has no field label, there is no way for a screen reader to know what that edit box should be called. On the other hand, the screen reader must be able to detect a field label and read it correctly to the user. Although advancements have been made in web design that allow web masters to provide labels more efficiently, many screen readers must still be able to track a field label that is close to a control in order for the label to read correctly. The most common form of a table is a spreadsheet. Provide quick access to large groups of information.
Tables are unique in that they serve multiple purposes.
Cells begin to contain groups of data, rather then single pieces of information. Many web designers use tables to align images, and to combine links into groups of links. If a table contains structured data, in say a textual graph, then it will be useful for the user to be able to determine where in the table they are currently residing. If a table is being used for the placement of images, however, the cell coordinates contain little or no useful information at all. Allowing a table to be accessible is dependant on both the web designer and the screen reader manufacturer.