Debugging Play Application Does Not Also Debug My Javascript/View Layer

Now I don't know if I'm just being stupid, or what I'm proposing is beyond the realms of possibility, but I would have thought with modern multi-stack web technologies, when debugging an application in Intellij, I'd be able to debug the lot from within Intellij.

For example, I'm currently developing a Play application, with my stack using a Scala for the controllers, and (obviously) Html/Javascript for the view.  If I debug the application and stick breakpoints in the scala code and also the javascript, I'd expect them all to get hit.  Being a Play application and using a 'Play 2 App' Debug configuration, I could appreciate that the debugger might only want to debug the Play Java/Scala source.  But frankly, having to use an external debugger for the view layer just doesn't sit comfortably with me.

Am I missing something here, or asking to reinvent the wheel?