Not Op but I doubt it. I tried Safari and it gave me an error that my browser doesn't support WebGL 2. Chrome works fine.
I tried with Safari after enabling WebGL 2 by using the 'Develop' menu, but even then the demo game me an error, "This example requires extension EXT_color_buffer_float".
Yep, I got the same thing. I guess support isn't complete yet?
I tried Chrome and Firefox. Other WebGL2 demoes ran very smooth.