MacSurf brings CSS3, ES5 JavaScript, and native HTTPS to Classic Mac OS 9 PowerPC systems
By
gattilorenz
Hot, fresh, and worth queueing round the block for.
Summary
MacSurf is an early-alpha web browser for Classic Mac OS 9 PowerPC systems (like the G3 iMac) that brings modern web technologies — CSS3, ES5 JavaScript, PNG with alpha transparency, and native TLS 1.2 HTTPS support — to 25-year-old hardware. Built with CodeWarrior on the Carbon API, it can render real websites and execute JavaScript on a 233 MHz G3 processor. However, the project is still rough: most of the modern web (heavy SPAs, advanced CSS features, form interactions) doesn't work, and JavaScript performance is slow on real hardware. The project is open source on GitHub under the MIT license.
Key quotes
· 4 pulledMacSurf is a web browser for Classic Mac OS 9 PowerPC. CSS3, ES5 JavaScript, PNGs with alpha, running on a G3 iMac.
It runs, it renders, it talks TLS 1.2 natively to real HTTPS sites (as of May 2026), and it executes JavaScript on a 233 MHz G3.
That doesn't mean it's ready for daily driving — most of the modern web still won't work in it.
Heavy SPAs, modern CSS features we haven't shipped, missing form interactions, slow JS on real hardware. Plenty is rough.
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