NaCl does not allow direct manipulation of the DOM or provide other JavaScript APIs like canvas. NaCl provides alternative ways of getting things done like pp::

NaCl does not allow direct manipulation of the DOM or provide other JavaScript APIs like canvas. NaCl provides alternative ways of getting things done like pp::Graphics2D, but it is not meant for DHTML. Dash, on the other hand, provides access to JavaScript APIs. I think that browser "assembly" code, like Dash, would have to support this, particularly if it is meant to be an alternative to compiling to JavaScript.