ADA Compliance

Does anybody know anything about ADA Compliance for websites? I gather this is an American thing, but I am hearing it mentioned more regularly lately and I gather it is serious. It’s associated with accessibility for the disabled and websites have to comply.

Nearly all my clients are UK based, though I have one in LA at the moment, so I am wondering what we should be doing in Blocs. There is something similar in the UK and Foundation make a big deal about this https://get.foundation/sites/docs/accessibility.html

The primary guidelines to date are the “Web Content Accessibility Guidelines V2” AKA (WCAG 2.0 AA) from from The World Wide Web Consortium (W3C). The primer: https://www.w3.org/WAI/intro/wcag