[kpk] Some of our pages swap parts of the page. When using a screenreader, the user will be unaware the page has changed, and the focus will remain on the navigation item. Sometimes the navigation itself is replace, and focus will return to the top of the whole section that was replaced. So, two questions: 1) is there a standard way to say "some page content has finished loading over there" without just reading it all out , and 2) is there a standard way to return focus to the navigation when the navigation is changed out?