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Data tables allow users to scan, compare, filter, sort, and manipulate information to derive insights and commit actions.
Proper symantec markup ensures that tables are accessible for screen readers and navigating with tabs.
Standard Row (with Indicator Dot)
Overflow
Default
Hover
Footer Row
In addition to being semantically built, tables must include the <caption> element. Complex tables or those with unusual structures may also benefit from a summary.
A <caption> is a table's title or heading. This element helps the user anticipate the content of the table. Unlike an HTML header, it is semantically linked to the table. This semantic association ensures that screen readers and browsers can understand the table.
Summaries provide further context around a table. They are not required, but they may help users understand how to navigate a complex or unusual table structure. Since summaries are not semantic HTML elements, there are different techniques that a developer can employ to associate them with their respective tables.
Please see the documentation to understand how this is done using HTML and Aria: W3C's Caption & Summary documentation