You can certainly make something with it, but I can't imagine most people finding a use for it.
Modern Internet is 45% appearances and 50% search traffic optimizations. For better or worse we lost all usable registries of websites, we lost appearance-less and traffic considerations-less websites. Information-focused Web is pretty much dead.
Maybe these ideas did not scale and did not monetize that well, but we will never really know what information-focused version of Internet would have looked like because evolution took it elsewhere. Unless we try building another one with different principles and limitations at the core.
Perhaps what's needed is for an alternative search engine. Assert that you will only index a site that meets some strict set of limits. If that's what people want they will use that engine. If it's popular sites will have have to find ways to get listed, e.g. "simple.amazon.com" which supports that standard.
Few old school sites like Wikipedia aside, modern Internet is serving a very different purpose: being an entertainment platform, being a backbone for building applications and monetizing them.
Yes, technically there are still underlying networks with instant delivery of content to any place on Earth, but maintaining something like Wikipedia on top of modern Internet is like trying to maintain a quiet library inside of a Casino. Monetization means don’t fit. You need a quiet space to read and study, not dingling sounds and bright lights, not free vodka and 50 security guys.
We need a new paradigm of information sharing and new ecosystem if we want to do things differently.
For me, the information-sharing part of the internet now is the shadow libraries. I can get access to all (well, still not quite all) journals and university-press publications from the last century? Awesome. Vastly more informative than some blogger who nowadays is probably trying to monetize my attention.
I’ve recently counted movies available on my HBO account and it is in low hundreds. There is absolutely no way to find a specific movie across existing services - information discovery is broken, and their subscription models force me to pay in weird ways (subscribe, watch, unsubscribe.. rental is scarce) for a relatively simple outcome.
Another weird example are books that are widely available on the web in pdf and other formats with absolutely no way to legally purchase them in electronic form. There is a vast untapped shadow network of people doing [often volunteer] work of publishers: scanning, uploading and categorizing content in a searchable way. At the same time most publishers who actually own rights to this content are prioritizing entertainment and attention focused platforms, where 20% of invested work already gives them 80% of business results.
One can argue that this is (a) the only economically viable model we could come up with and (b) most people that are looking for entertainment don’t really have this problem.
Even so, those who want to share and access information can already do that via the Web. Nobody has to use scripting. Nobody has to use The Google as their search. Nobody has to rely on an LLM. If there is demand for simple webpages that are free of scripting, they can be built and shared today. Because of this, the proposal comes off as very out of touch and deep within the HN bubble. Strict grammar for declaring documents is merely a fetish. If there's no scripting, then there's no reason for a document to break for some silly reason.