Most of the elements that you add to your Blocks app are ARIA (Accessible Rich Internet Applications Suite) -compliant. You can use the accessibility panel in Blocks to improve the accessibility of elements and widgets that are not ARIA-compliant.
Important note about compliance:
You can add accessibility attributes to an element or a widget.
DOM order is used by assistive technologies to help some visitors find the information they need (Learn more).
When a site visitor clicks "Tab" in your Blocks widget, it goes through your elements in the same order that they appear in the Layers panel (from bottom to top). You can edit this order as you wish, by draging the elements in the layers panel.
Go to Preview to see how it works.