Accessibility
ItemGroup renders a ul. The default role is list when you do not pass role, so a marker-less list is still exposed as a list in WebKit.
Item children carry the row semantics: link, button, or static li. Pass role on the group only when the owner pattern requires a different host role, such as a menu or listbox that sets item roles on the rows themselves.
style cannot be passed. Native ul attributes other than style and on* handlers pass through, including hidden.