Auto focus movement with dynamic updates

All,

I have reviewed 2.4.3, 3.2.2 and 3.2.5 and need verification for web sites that use dynamic content after an action has been initiated on an input element like a link, button, treeivew node, tab strip, etc. After the page has dynamically updated, should the focus move? This is not related to automatic focus movement within a form which is covered by 2.4.3. The actions are:

1.      User moves keyboard focus on to an element. Such as a tree view sub-node or a link.

2.      They press enter to activate the item.

3.      The same page dynamically updates showing new content. The main navigation elements still exist.

4.      The focus moves to the first element on the new content shown.
My feeling the above is incorrect and if so, not sure which WCAG SC would apply. Comments?


Sean