Beyond Browsers: The Longterm Future of JavaScript Standards.

These questions about what belongs in JavaScript runtimes both in and beyond the browser are one of the reasons the WinterCG (for Web Interopable Runtimes) community group at the W3C started last year: to focus on cross-runtime interoperability between browsers and non-browser runtimes, advocating for features important to serverside JavaScript environments that may not be as critical for browsers — which is all the charter for WHATWG covers.
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The Minimum Common Web Platform API list is starting fairly modestly by documenting which Web Platform APIs are already implemented in Node.js, Deno, and Cloudflare Workers. But it’s also a first step towards a comprehensive unified API surface that JavaScript developers should be able to rely on in all Web-interoperable runtimes.