The menubar role - ARIA Reference Guide

Composites
Represent containers for navigating interactive descendants.
Landmarks
Represent top-level sections of a page, relevant to a specific purpose, that a user may want to scan for quickly and could appear in a site map or table of contents.
Live Regions
Represent dynamic content or announcements, typically updated as a result of an external event when user focus may be elsewhere.
Structures
Represent non-interactive parts of a page that organize content into coherent units.
Widgets
Represent focusable, interactive elements.
Windows
Represent inner windows that are children of the main web document.

WAI-ARIA spec HTML-ARIA spec

Composite(opens in new window)Flow Content(opens in new window)Interactive Content(opens in new window)

Description

A presentation of menu that usually remains visible and is usually presented horizontally.

Allowed Content

This role requires specific descendant roles. These may include menuitem, menuitemcheckbox, and menuitemradio roles.

HTML Elements with Implicit ARIA Role

(None)

Allowed HTML Elements

menu
nav
ol
ul
div, span, p, other elements that can receive any role