via http://www.emucr.com/

JSPspEmu Git (2014/06/09) is released. JSPspEmu is a PSP emulator made using javascript (actually typescript). It will work with any modern browser. Though the first version work only works with Chrome (desktop and android). At this point it can run some demos.

JSPspEmu Git Changelog:
- Upgraded to work with Safari 8 (Added a polyfill for window.performance.now())

- Obtained info about polyfills installed

http://jspspemu.com/