Occasionally I need to spend a whole day or 2 learning that I can't do a thing I thought was possible.
I thought it'd be super neat to load a whole website in a qr code using data URLs. You can in fact put a site in a data URL, but you can't navigate to it without copy and pasting it into your URL bar. MDN states that towards the bottom of that link above:
A number of security issues (for example, phishing) have been associated with data URLs, and navigating to them in the browser's top level. To mitigate such issues, top-level navigation to data: URLs is blocked in all modern browsers.
MDN on security of top level Data URLs
That makes sense. There's a certain amount of accountability when you have a server hosting something.
Now I get why Nicholas Jitkoff made bitty.site, which does a bunch of voodoo to compress a site into the URL. You still need to have had an internet connection at some point. But it's not a bad work around.