If I understand you, I think it's a bit much to expect ScalaJS to somehow change the platform it is targeting, which is the browsers as accessed via Javascript

If I understand you, I think it's a bit much to expect ScalaJS to somehow change the platform it is targeting, which is the browsers as accessed via Javascript (ie. without requiring plugins which would have made it DOA for most use cases). If browsers don't want threads that share data via Javascript control, and it appears they don't, and by design, then what is the alternative for ScalaJS? Same situation as with Javascript.