[Menu] Item lacks aria-expanded before first submenu open #2666
Description
Provide a general summary of the issue here
Description:
In the submenu variant of the menu component, the menu item that triggers the submenu does not have the aria-expanded attribute before the submenu is opened for the first time. As a result, screen reader users are not informed that the menu item has a submenu. The aria-expanded attribute only appears after the submenu has been opened once.
Expected behavior:
The menu item that triggers a submenu should always have the aria-expanded attribute, set to false by default, so that assistive technologies can announce the presence of a submenu before it is opened.
Link to finding: #2574 (comment)
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