The single piece of extra browser compatibility I have found in Deno is that it supports the fetch API, and Node 18+ has that as well. Beyond that there is really no difference between the two.
Whilst I mostly agree, and Node has arguably been forced down the browser-compatible route (for stuff like fetch() and web streams). There is a bunch of other stuff that isn't in Node, or it has it's own APIs for... alert/confirm for getting user input, Web Crypto, URLPattern etc. You can see them all here: https://docs.deno.com/runtime/manual/runtime/web_platform_ap...