Tema: aria
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ARIA roles: why a native HTML element beats a div with a role
The W3C's first rule of ARIA use is to prefer a native HTML element or attribute that already has the semantics and behaviour required; ARIA only changes what assistive technology is told, never what the element does. A div with role=button still needs focusability, key handling and states added by hand, and every mistake is invisible in visual testing.
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Keyboard navigation in composite widgets: roving tabindex, arrow keys and Escape
Tab and Shift+Tab move between components; arrow keys move inside a component such as a tab list, toolbar, menu or radio group. Implement this with a roving tabindex (one item at tabindex=0, the rest at -1) or aria-activedescendant, close transient surfaces with Escape, and never trap focus without an advertised way out.
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