Another thing I have discovered looking at the source at run-time… all anchor tags have a tabindex. This includes anchor tags without an href, which are not interactive, but used as “bookmarks” to jump to. I don’t believe these anchors should have a tab index.
Andrea, this is probably what you are seeing (or not seeing) between buttons. The focus is going to these non-visible objects because they have a tabindex set. I’d have to look more closely, but it appears that every text element has an anchor tag with it.
I also noticed that the default audio media player controls have tabindex set to zero which means these controls do not receive focus until last, regardless of where the controller is placed.
I’m going to submit a ticket on this. There’s enough here that needs a closer look by the Trivantis team.