Do Ionic components comply with accessibility requirements?

the rules relating to the creation of websites and apps for public administrations require compliance with accessibility standards (e.g.: Web Content Accessibility Guidelines (WCAG) 2.1).

I’ve done Ionic app in the past, but it’s the first time that I have to implement a PWA with these strict requirements.

Which is your experience with this problem?
For example, the screen readers and the of assistive technologies can browse a Ionic site or a Ionic PWA ?
I’ve some doubt since Ionic uses a fairly complex virtual DOM.

Thank you for you suggestions and your opinion.