What makes you say this? A server is rendering/outputting HTML as output from a GitHub action that builds via Deno.
Did you think your browser was assembling the HTML?
Did you think your browser was assembling the HTML?
But anyway, regardless of what you want to call it: this whole thing is just a silly exercise to get a bunch of XML and transform into (X)HTML. If it works for them... ¯_(ツ)_/¯