JSPspEmu Git (2014/05/15) 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:
- Implemented gpu call + ret
#1 WIP VFPU - Much more work vfpu
#1 WIP VFPU - Fixed cubevfpu
#1 WIP VFPU - Implemented color conversion and [sl]vl[lr].q instructions
#1 WIP VFPU

Try online: JSPspEmu Git (2014/05/15)
Source: Here