Looking to access 16-bit image data in Javascript/WebGL

Question

I'm trying to download 16-bit image data from a server and push it into a WebGL texture without browser plug-ins. texImage2d will work with: ImageData, HTMLImageElement, HTMLCanvasElement, or HTMLVideoElement. I'm looking for some javascript (a library or code sample) which can decode 16-bit TIFF or similar (hdf5, etc.) image data into one of these object types.

I have no problem doing this is 8-bit per channel RGB by using an to load a PNG but this doesn't work with 16-bit per channel data since there aren't any "standard" browser supported image formats which are 16-bit.