.Dropdown
renders
visually hide the `Dropdown-menu` when not in the `is-expanded` state
.Dropdown-menu
contains mixed text and link items.
default placement
default rtl placement
Dropdown-menu--inversePlacement
Dropdown-menu--inversePlacement rtl
Dropdown-menu--upPlacement
.Dropdown-item
.is-active
can be separated with .Dropdown-item--separated
.Dropdown-link states
hover
focus
active
Accessibility: show an error when Dropdown-toggle doesn't have
[aria-controls]
[aria-expanded]
[aria-haspopup]
Accessibility: show an error when Dropdown-menu doesn't have
role="menu"
[aria-hidden]
Accessibility: show an error when Dropdown-item doesn't have
role="menuitem"