What are these tags? ally-selected, ally-focuser and ally-focusguard are below the wrapper in the HTML output, and on mobile (only on mobile, for some reason?) ally-focusguard in particular is adding a gap between the wrapper and the end of the body, so there is a white gap at the bottom of our Adapt courses. I don't want to set display:none on these elements without knowing if this could have some unintended consequences - so what are these tags used for? Any other way I could prevent this gap from showing up?