I wrote a new emulator for Pdp8 in Javascript to make it more portable and here you can see the result.

You can find the source code on the js-pdp8 repo with also the reference and some tips.

The emulator is separated from the app and can be used with NodeJS, furthermore the app is compatible with NW.js and you can start it with that.

Now try the example below: click Compile, then Start and Run to see the execution of the source code.