default element landmark not listed

[lingtalfi]

Hi, not sure if that's an issue, but when I use the "Show landmarks list" shortcut,
chromeVox doesn't read the implicit landmarks of the html elements.

Referring to this page: https://www.w3.org/TR/2014/REC-html5-20141028/dom.html#aria-usage-note:

it says that a nav element (for instance) has an implicit navigation role.

Now in this page: https://www.w3.org/TR/wai-aria/roles, it says that the "navigation" role is categorized as a landmark role, and therefore I was expecting ChromeVox to pull landmark information from such html5 markup.

That would be great if it actually did, unless there is a specific reason not to do so.