Bert is progressing with his SqueakJS project. A current version can be found here:
He can also run Smalltalk 78 on the Lively Kernel. The nice thing is all the VM code is fully accessible - you can also check the virtual machine while it is running.
If you want to try it yourself just open this page in your webbrowser:
Really interesting are also the details (for instance on GarbageCollection and on how to run one high level language on another high language.
Here are the videos from ESUG 2014 on that: