It really is super annoying. I guess it's Apple and Google's little game to annoy people who use both companies. Apple is like "Too bad Google Fi sucks with iPhone, maybe you should use some other carrier" and Google is like "Too bad iPhone sucks with your Google Fi, probably should be using an Android". I imagine Apple could fix it by not clearing those fields on literally every iOS update, and probably Google could fix it because why doesn't this happen on other carriers?

You run into this on microcontroller based "web servers" because you're not really running a proper web server following the HTTP protocol- you're just returning your HTML content directly on the socket. Ask me how I know :-) Ran into the same problem on the Raspberry Pi Pico W. Anyway, how do you fix this? I did the following (the client variable is the open socket you're writing back on): html = "Your HTML code or generator goes here, along with your javascript that isn't working" client.send("HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n") client.send(html) client.close() That's about the bare minimum you need to pretend to be following the HTTP protocol. Then Safari won't put your webpage in its sandbox.