JSPspEmu Git (2014/03/26) 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:
* - Added support for "debugger;" to the ast
- Small improvements in clut decoding
- Fixed texture coords with transform2d
* - Added two samples and more work on clut

Try online: JSPspEmu Git (2014/03/26)
Source: Here