this is how they construct a UIMenu but for the web platform. Take a look at the color values in the sidebar — those are all undocumented WebKit-only colors that map 1:1 with the colors provided by the system. Here’s all of them: https://github.com/WebKit/WebKit/blob/35b9037171bb6b1e4fba5754093baac2286a1321/Source/WebCore/css/CSSValueKeywords.in#L275
https://hachyderm.io/@samhenrigold/112118704155841567