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Comment from Stefan 4.1.3 Keyboard Navigation within Widgets - should include a block of general info how to navigate within list and list like items (Arrow keys, HOME/END keys) or a link to respective location of general concept descriptions within document (such as 2.1 Generally Applicable Keyboard Recommendations) - should also explicitly list use cases where arrow navigation between list-like items is NOT required (such as a "list" of buttons in toolbar)
Keyboard section rewritten. Please open new issue if required.