There is already a plethora of languages which can be compiled to Javascript and have the Web APIs accessible to them. Someone made an efford to list a lot of them here: github.com/jashkenas/coffeescript/...
And since WebAssembly is in the minimum viable product state, I think we will very likely in the not so far future see many more capabilities of the browser made accessible by it.
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There is already a plethora of languages which can be compiled to Javascript and have the Web APIs accessible to them. Someone made an efford to list a lot of them here: github.com/jashkenas/coffeescript/...
And since WebAssembly is in the minimum viable product state, I think we will very likely in the not so far future see many more capabilities of the browser made accessible by it.