Currently there are links in our '?' dropdown that: * pop open a new tab/window (`See what's new at GitLab` and `Contribute to GitLab`) * go to another page within the GitLab instance (`help`) * use the same window to open an external link (`Support` and `Submit feedback`) * open a modal (`Keyboard shortcuts`). Since almost all nav items in GitLab open in the same page, it might be a nice UX to indicate when something opens in a new tab. That way the user knows they can click that item and not lose their current place. I'm not sure if they should apply to items that open in a modal. It's worth considering since the result is the same - the user doesn't need to be concerned about losing their place.