WebMSX Git (2016/08/23) is released. WebMSX, or simply WMSX, is a new cross platform MSX emulator designed for the Web. WebMSX is great for displaying MSX software running inside webpages. You can launch the emulator and load ROMs, DSK and CAS images with a single link.

WebMSX Features:
* Show any MSX game/software running with a single link to this page
* Put a MSX computer on your own webpages easily
* 9 Generic machines (MSX1, MSX2, MSX2+). NTSC 60Hz or PAL 50Hz
* PSG, SCC, SCC-I, FM-PAC and MSX-MUSIC sound
* Cross platform HTML5/JS. Runs in any Browser, tested in Chrome/Firefox
* Runs locally with a single HTML file, no install needed
* Play Cartridge ROMs, Disk and Tape images
* Powerful Drag & Drop system for loading media files
* Load several disks at once and easily switch disks
* "Files as Disk" and "ZIP as Disk" emulation
* Savestates support. Export and share Savestate files
* Keyboard, Gamepad and Mouse controllers with auto-detection
* Easily toggle extensions like SCC, PAC, DOS2, etc.
* Adjustable speed, Pause and Frame-by-frame advance
* Copy & Paste text, Screen Capture, Debug modes
* Resizable Screen, Full Screen mode
* Javascript API for loading media and machine control

WebMSX Changlog:
* Keyboard configuration GUI (WIP)

Try: WebMSX
Source:Here