ARIA Rule : A Main landmark should be available in the SuperTables structure
Screen reader users can use keyboard shortcuts to navigate directly to the first h1, which, in principle, should allow them to jump directly to the main content of the web page. If there is no h1 or if the h1 appears somewhere other than at the start of the main content, screen reader users must listen to more of the web page to understand its structure, wasting valuable time. To tackle this this issue we have added an invisible heading which will help the screen reader to easily recognize the SuperTables container. Check the Product Guide for more information.