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9a3e002e8f
As the question often comes up about why Bootstrap does not do "true" ARIA menus (with their `role="menu"` etc), add an admittedly lengthy note (tl;dr because BS is generic, and ARIA menus are specific and quite limiting). Additionally, fixes up the `<a>` example for dropdown trigger, with the missing `role="button"` and neutering the `href` (which would be useless anyway since BS overrides the link-like nature of the `<a>` so it could never be triggered/followed anyway)