A11y_AzureNotebooks_Jupyter_MenuBar_ScreenReader: Narrator in not announcing the Expand/Collapse state for Menuitems(Edit,View,Insert,Cell...etc).

[AccessibilityTestingTeam-TCS]

EnvironmentDetails:
Application Name:AzureNotebooks_Jyupter
Login Url: notebooks.azure.com
BrowserDetails:
Edge:Microsoft Edge 41.16299.611.0
Operating System:Windows10

ReproSteps:

1. Login with the appropriate credentials to azure notebook account.
2. Navigate to any of the file names present in the samples-->>clickin the file name-->Welcome page opens with menubar.
3. Start Narrator.
4. Navigate till menubar and Verify Narrator is not announcing Expand/Collapse state for any of the menuitems(Edit,View,Insert,Cell...etc).

Actual:
Narrator in not announcing the Expand/Collapse state for Menuitems(File,Edit,View,Insert,Cell...etc).

Note:
Same issue is observed in NVDA also.

Same issue is observed for "RunningTab" page for "Terminals" and "NoteBooks" Dropdowns.

1. RunningTab--> Navigate to run button & hit enter --> Navigate to running tab & hit enter.

Expected:
Narrator should announce the Expand/Collapse state for all Menuitems(File,Edit,View,Insert,Cell...etc).
For Example: When "File" menu is Expanded Narrator should announce "File"Menu Expanded. And When "File" menu is Collapsed Narrator should announce "File"Menu Collapsed.

UserImpact:
If ScreenReader not announcing Expand/Collapse state then Screenreader users may not be able to know control is expanding or not.

Attachment:
(https://github.com/jupyter/notebook/files/2400358/A11y_AzureNotebooks_Jupyter_MenuBar_ScreenReader.pptx)

[jtpio]

Closing as there are now different issues tracking accessibility improvements for Jupyter Notebook 7, for example #6800

Thanks!