That popup menu is not accessible though, no keyboard navigation and if you really wanted follow all accessibility guidelines you still need javascript to toggle attributes and stuff. https://www.w3.org/TR/wai-aria-practices-1.1/examples/menu-b...
(Although, you could argue the end-result for users who need accessibility features is the same, regardless of who is at fault.)
[1] please note the content on the page is outdated, this is just a prototype -- the drop-down below "PayPal": https://sdproto.gitlab.io/donate/