JSPspEmu Git (2014/05/23) 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:
- Vfpu refactorings
- WIP: Faster Vfpu

Try online: JSPspEmu Git (2014/05/23)
Source: Here