During a recent 508 evaluation on a USWDS-based site, the following was reported back to us regarding the tabs at the top of a node (e.g., View, Edit, etc.):
Although the Edit and View links are styled to look like tabs, they do not interact like tabs. Tabs make dynamic changes to a page upon activation. The Edit and View links target a link and cause the browser to load a new page. They may be styled to look like tabs for visual users, but they are just ordinary links and should be interpreted as links by assistive technologies.
Look at any node as an admin and note:
Replace "tabs" with something else, perhaps a USWDS button group.
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2.4
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