Consider an attribute to declare the presence of a "context menu" for a currently-focused element

[vick08]

Description of bug or feature request

Some web apps, such as GOogle Calendar or Gmail, provide context menus for the currently-focused control that can be activated by either invoking a browser's right-click menu or a screen reader specific "context menu" shortcut key, e.g. Shift+F10 (Windows) or Control+Option+Shift+M (VoiceOver / Mac).. It does not appear that ARIA currently allows developers to declare the presence of such menus to the screen reader or another AT user. This feature request is to consider an ARIA attribute to cover this particular use case.

Will this require a change to CORE-AAM?

If unknown, leave blank. If relevant, link bug.

Will this require a change to the ARIA authoring guide?

Yes

If unknown, leave blank. If relevant, link bug.