You can run every version of Classic Mac OS right in your browser

You don’t need to fire up that old Mac to experience Classic Mac OS anymore. No more emulators and ROMs. No, it’s much easier now since you can boot up every major release of Mac OS from the 1980s and ’90s right in your web browser.
Mac OS 7.6 was released on January 7, 1997
D. Griffin Jones for Cult of Mac:To try it yourself, go to infinitemac.org, a project run by software engineer Mihai Parparita. There, you can browse through all the major revisions of the Macintosh System