Russ and Roger Hudson did some tests on data tables. These tests measured id and headers and scope for table headers and what were supported better by assistive devices.
At this stage, it appears that id and headers are the most effective way to make complex data tables accessible. Although id and headers are slightly more difficult to code than scope, the apparent poor screen reader support for scope means that this is probably not an effective accessibility option.
The full report is just chock-full of good accessibility info. Defintely worth a read. The bottom line is to make your data tables as simple as possible. Once you start making it complex, id and headers are the way to go.
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Posted at 05:23 AM