Can chromaticities or primaries to be emulated?

[unit-404]

I interesting about emulation chromaticities or primaries. Can be it done by something way on canvas? What required to do that? Needs or no floating point support? And how emulated (if possible) should to be converted to image when export? I means about redX, redY, greenX, greenY, blueX, blueY, whiteX, whiteY.

I'm also hoping for the return of at least JNG format browsers. After all, I believe there are many prerequisites for that. I mean technically and theoretically it is possible.