At a first glance at the demo gallery, nothing there is labeled as a button except for some in the embedded frame. The buttons there does not have an accessible

At a first glance at the demo gallery, nothing there is labeled as a button except for some in the embedded frame. The buttons there does not have an accessible label though. Nothing is list or grid, on the page and when any of the demo buttons are pressed, the focus is not moved to the new content. So, aria-role and aria-label as a start, I think.