@lvh: I recently wrote a long issue on the W3C's WebCrypto issue tracker regarding what needs to happen to have the commonly used cryptographic primitives used in digital currency available in the browser. Are there any particular features from NaCl you would like to see? I will probably attempt to write pull requests for the spec to include the relevant features I have outlined. https://github.com/w3c/webcrypto/issues/82

Might be in vain, but I did have a chance to meet one of the members of this committee earlier this year when they were at a conference in my town.