Complex Data Tables

A complex data table has at least one heading that spans multiple rows or columns. The table shown in Figure 6-2 (which was taken from is a complex table because it has both row and column headings and several of the row headings span multiple rows. For example, “Flash Flood” applies to four rows—map numbers 21–24.

Example of a complex table

Figure 6-2. Example of a complex table


A well-written summary can provide a verbal map that helps someone using a screen reader navigate the data more efficiently:

<table summary=" The table is divided into six columns: Map number, Date, ...

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