FOLIO as a system needs to achieve a level of WCAG requirement in order to be adopted for some institutions; WCAG is the international accessibility standard and European Law requires all public sector bodies to comply.
Lots of issues related to Accessibility as presented at the PC on 28-March-2019. Chose the WCAG requirement to link to - not sure if there's a better overarching issue
Update July 17 2019: Some discussions but no specific dev or testing plans have been identified. Khalilah Gambrell is the defacto lead for this effort. Some JIRAs have been entered and will be included in the Capacity Plan. Ryan Berger will be moving more time into Stripes Force and will take on some PO duties on the more technical aspects.
Note new European standards now also require WCAG 2.1 AA (=EN 301 549 V 2.1.2).