I was trying http://processingjs.nihongoresources.com/mathparser/?fx=x1*t^3+x2*3*t^2*(1-t)+x3*3*t*(1-t)^2+x4*(1-t)^3&fy=y1*t^3+y2*3*t^2*(1-t)+y3*3*t*(1-t)^2+y4*(1-t)^3&labels=t,y1,x1,y2,x2,y3,x3,y4,x4&start=0,0,0,0,0,0,0,0,0&end=1,100,100,100,100,100,100,100,100&resolution=0.01,0.1,0.1,0.1,0.1,0.1,0.1,0.1,0.1&values=0,0,0,50.8,0,0,48.3,25.4,83.1 out on my android device (Asus Transformer Pad) with Android 4.0.3 and Firefox Beta for Android, and noticed the <input type="range"> elements didn't show up. I guess this could either be a bug report or feature request: they don't appear to work, either they're supposed to and it's a bug, or they haven't been implemented yet, and it's a feature request =) - Pomax