iPhone and iPad
The browser on the iPod touch, iPhone, and iPad is Mobile Safari. Per Apple's App Store Review Guidelines, all other web browsers that run on iOS and iPadOS wrap the same system WebKit library as Safari. This means they have the same deficiencies in support for web platform features as Safari, no more, no less.
Some traditionalists remember protocols other than HTTP, such as SMTP, IMAP, IRC, Usenet, FTP, SSH, and the like. They suggest that applications with interactivity needs greater than navigation and form submission be replaced with with non-web protocols that are publicly documented with a reference implementation distributed in source code form under a free software license. It remains unclear, however, how "here's a free protocol, here's a reference server and client for GNU/Linux or macOS, feel free to pool your money with other people to hire someone to write a client for the proprietary or semi-proprietary platforms that people actually use" can lead to adoption by enough people to replace entrenched web applications.
- Chris Love. "What is the Service Worker ⚙️ Cache Storage Limit? How Much Your Progressive Web App (PWA) Can Store". Love2Dev, 2019-10-29. Accessed 2020-02-03.
- Catalin Cimpanu. "Half of the websites using WebAssembly use it for malicious purposes". ZDNet, 2020-01-07. Accessed 2020-01-10.
- Zack Whittaker. "Mozilla says a new Firefox security bug is under active attack". TechCrunch, 2020-01-10. Accessed 2020-01-10.
- JNCF, 2019-07-20
- Conversation between tepples and Editorial Failure, 2021-02
- A popular "semi-proprietary" platform is Android, which is free software, combined with Google Play Services, which is proprietary software.