These may be problematic when encountering some large or more complex tables. 3.3 Table techniques Tables were designed to structure relationships among data. In graphical media, tables are often rendered on a two-dimensional grid, but this is just one possible interpretation of the data.
Layout tables cause problems for some screen readers and when rendered, confuse users.
Even data tables can be difficult to understand for users that browse in essentially one dimension, i.e. for whom tables are rendered serially. The content of any table cell that visually wraps onto more than one line can be a problem. If only one cell has content that wraps, there is less problem if it is in the last column. Large tables pose particular problems since remembering cell position and header information becomes more difficult as the table grows. User agents facilitate browsing by providing access to specific table cells and their associated header information.